Fix capture of GlobalPhase and Identity when they act on no wires

[albi3ro]

Context:

When writing tests for (#837), I found we weren't capturing Identity and GlobalPhase when they act on zero wires correctly.

Description of the Change:

Fix the capture of GlobalPhase and Identity when they act on no wires.

Benefits:

Possible Drawbacks:

Related GitHub Issues:

[sc-70350]

[dime10]

Thanks for the fix 👍

(Related issue regarding the documentation for GlobalPhase: #5820)

[dwierichs]

Nice catch, thanks @albi3ro

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.65%. Comparing base (6715095) to head (80582ff).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6060      +/-   ##
==========================================
- Coverage   99.66%   99.65%   -0.01%     
==========================================
  Files         430      430              
  Lines       41638    41387     -251     
==========================================
- Hits        41499    41246     -253     
- Misses        139      141       +2     

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