Fix GUI crash when accessing bad rendering UserData

[chapulina]

🦟 Bug fix

Summary

Fix a bug that came up during the tutorial party. Without this fix, the AlignTool plugin crashes on use.

I went ahead and guarded all instances of UserData that weren't already protected by try / catch blocks.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[adlarkin]

Looks like codecheck is failing:

  Scanning dependencies of target cpplint
  /github/workspace/src/gui/plugins/align_tool/AlignTool.cc:368:  Line ends in whitespace.  Consider deleting these extra spaces.  [whitespace/end_of_line] [4]
  Total errors found: 1
  CMakeFiles/cpplint.dir/build.make:57: recipe for target 'CMakeFiles/cpplint' failed
  make[3]: *** [CMakeFiles/cpplint] Error 1
  CMakeFiles/Makefile2:1161: recipe for target 'CMakeFiles/cpplint.dir/all' failed
  make[2]: *** [CMakeFiles/cpplint.dir/all] Error 2
  CMakeFiles/Makefile2:880: recipe for target 'CMakeFiles/codecheck.dir/rule' failed
  make[1]: *** [CMakeFiles/codecheck.dir/rule] Error 2
  Makefile:522: recipe for target 'codecheck' failed
  make: *** [codecheck] Error 2