Fix pdm show specific package with werid output

[linw1995]

Pull Request Check List

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

Run the command pdm show xxx to print specific package info. It got weird output instead.

Run pdm show pdm

❯ pdm show pdm
Name:                  pdm                                                                                  
Latest version:        1.7.2                                                                                
Latest stable version: 1.7.2                                                                                
Installed version:     1.7.3.dev22+g29b6e62.d20210804                                                       
Summary:               Python Development Master                                                            
Author:                                                                                                     
Author email:          frostming <mianghong@gmail.com>                                                      
License:               MIT                                                                                  
Homepage:                                                                                                   
Project URLs:          D                                                                                    
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Platform:                                                                                                   
Keywords:              p, a, c, k, a, g, i, n, g, ,, d, e, p, e, n, d, e, n, c, y, ,, w, o, r, k, f, l, o, w

Or run pdm show colorama

Name:                  colorama                                                                                                                                                                                   
Latest version:        0.4.4                                                                                                                                                                                      
Latest stable version: 0.4.4                                                                                                                                                                                      
Summary:               Cross-platform colored terminal text.                                                                                                                                                      
Author:                Jonathan Hartley                                                                                                                                                                           
Author email:          tartley@tartley.com                                                                                                                                                                        
License:               BSD                                                                                                                                                                                        
Homepage:              https://github.com/tartley/colorama                                                                                                                                                        
Project URLs:                                                                                                                                                                                                     
Platform:              U, N, K, N, O, W, N                                                                                                                                                                        
Keywords:              c, o, l, o, r,  , c, o, l, o, u, r,  , t, e, r, m, i, n, a, l,  , t, e, x, t,  , a, n, s, i,  , w, i, n, d, o, w, s,  , c, r, o, s, s, p, l, a, t, f, o, r, m,  , x, p, l, a, t, f, o, r, m

This PR resolves all the above issues.

[frostming]

Is this function necessary? It does the same as keywords = metadata.get("keywords", "").replace(",", ", "), or just don't replace, use it as is.

[codecov-commenter]

Codecov Report

Merging #580 (8967ecd) into main (29b6e62) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #580   +/-   ##
=======================================
  Coverage   84.05%   84.06%           
=======================================
  Files          68       68           
  Lines        5563     5566    +3     
  Branches      980      981    +1     
=======================================
+ Hits         4676     4679    +3     
  Misses        614      614           
  Partials      273      273           

Flag	Coverage Δ
unittests	83.92% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pdm/models/project_info.py	95.12% <100.00%> (+0.38%)	⬆️

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[frostming]

LGTM