Check if PinTable exist before calling gen_bitstream_setting_xml

[chungshien-chai]

Motivate of the pull request

• To address an existing issue. If so, please provide a link to the issue:
• Breaking new feature. If so, please describe details in the description part.

Describe the technical details

What is currently done? (Provide issue link if applicable)

Check if pin table exist before calling gen_bitstream_setting_xml

What does this pull request change?

Which part of the code base require a change

• Library:
• Plug-in:
• Engine
• Documentation
• Regression tests
• Continous Integration (CI) scripts

Impact of the pull request

• Require a change on Quality of Results (QoR)
• Break back-compatibility. If so, please list who may be influenced.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 14.75%. Comparing base (494be28) to head (2ae92be).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Compiler/CompilerOpenFPGA.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1716      +/-   ##
==========================================
- Coverage   14.75%   14.75%   -0.01%     
==========================================
  Files         478      478              
  Lines       66518    66519       +1     
  Branches    26164    26183      +19     
==========================================
  Hits         9812     9812              
- Misses      55470    55472       +2     
+ Partials     1236     1235       -1     

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