Add Test Cases for ListMeeting and Improve Code Quality

[junweimoo]

No description provided.

[codecov-commenter]

Codecov Report

Base: 64.63% // Head: 65.19% // Increases project coverage by +0.55% 🎉

Coverage data is based on head (43f437b) compared to base (ab21519).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #326      +/-   ##
============================================
+ Coverage     64.63%   65.19%   +0.55%     
- Complexity      672      680       +8     
============================================
  Files           112      112              
  Lines          2268     2270       +2     
  Branches        252      253       +1     
============================================
+ Hits           1466     1480      +14     
+ Misses          707      693      -14     
- Partials         95       97       +2     

Impacted Files	Coverage Δ
...in/java/seedu/address/logic/parser/ParserUtil.java	98.18% <ø> (+12.72%)	⬆️
...edu/address/logic/commands/ListMeetingCommand.java	78.57% <25.00%> (-21.43%)	⬇️
...address/logic/parser/ListMeetingCommandParser.java	100.00% <100.00%> (+100.00%)	⬆️

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[sikai00]

looks good