fix add manual new variable in FS

[alexanderBruno]

Proposed Changes

• Fix problem when add new variable in manual mode on Feature Set.

Pull request checklist

Please check if your PR fulfills the following requirements:

• [x] Tests
• [ ] Build locally
• [ ] Code format / lint
• [ ] Docs have been reviewed and added

Pull request type

Please check the type of change your PR introduces:

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

What is the current behavior?

Issue Number: N/A

Fixes #352

What is the new behavior?

• Fix problem when add new variable in manual mode on Feature Set.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

[codecov-commenter]

Codecov Report

Merging #354 (932d275) into master (f0db551) will decrease coverage by 0.01%. The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master    #354      +/-   ##
=========================================
- Coverage    3.35%   3.34%   -0.02%     
=========================================
  Files          32      32              
  Lines        1132    1136       +4     
  Branches      112     113       +1     
=========================================
  Hits           38      38              
- Misses       1094    1098       +4     

Impacted Files	Coverage Δ
...w-variable-dialog/new-variable-dialog.component.ts	3.63% <0.00%> (-0.29%)	:arrow_down:

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