fix(prefer-to-have-value): check that property exists before accessing

[G-Rath]

What:

Fixes a crash caught by #229 in prefer-to-have-value

Why:

It assumes that property will always be defined on the queryNode node if callee.name isn't, which is not always the case.

How:

I've implemented a guard to ensure that the property exists before trying to access it's name.

Checklist:

• Documentation N/A
• Tests
• Ready to be merged
  

[codecov]

Codecov Report

Merging #243 (f1983c4) into main (e8cefd3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #243   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines          560       561    +1     
  Branches       156       157    +1     
=========================================
+ Hits           560       561    +1     

Impacted Files	Coverage Δ
src/assignment-ast.js	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 3.9.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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