Fix LT-22760

[AndyBlack]

Change-Id: Ia24a6d7fc28fa18d6d8983e9f2fa44aedb89216a

The fix is to use the BuildCreateNewOpenCancelDialog whenever an operations file cannot be found. Before we'd also check on the filename to see if it was null or empty before using this dialog. There's no need for that.

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This change is 

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   12m 42s ⏱️ + 1m 3s
6 011 tests ±0  5 930 ✅ ±0  81 💤 ±0  0 ❌ ±0 
6 020 runs  ±0  5 939 ✅ ±0  81 💤 ±0  0 ❌ ±0 

Results for commit 5245bfc. ± Comparison against base commit 1ab408b.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.58%. Comparing base (1ab408b) to head (5245bfc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1123   +/-   ##
=======================================
  Coverage   38.57%   38.58%           
=======================================
  Files        1514     1514           
  Lines      351014   351014           
  Branches    40355    40355           
=======================================
+ Hits       135418   135435   +17     
+ Misses     186380   186364   -16     
+ Partials    29216    29215    -1     

see 2 files with indirect coverage changes

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[papeh]

unintentional whitespace change