feat: allow filing of Nil return for GSTR-1 (backport #2906)

[mergify]

• closes: Allow filing of Nil return for GSTR-1 #2880

Show a checkbox to file NIL return if there is no data in books.

_{Huly®: IC-3086}

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 59.68%. Comparing base (c2c2268) to head (5a05376).
Report is 13 commits behind head on version-15-hotfix.

Files with missing lines	Patch %	Lines
...st_india/doctype/gst_return_log/generate_gstr_1.py	25.00%	6 Missing ⚠️
...mpliance/gst_india/api_classes/taxpayer_returns.py	25.00%	3 Missing ⚠️
...iance/gst_india/doctype/gstr_1_beta/gstr_1_beta.py	0.00%	2 Missing ⚠️
...mpliance/gst_india/utils/gstr_1/gstr_1_download.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           version-15-hotfix    #2958      +/-   ##
=====================================================
- Coverage              59.71%   59.68%   -0.04%     
=====================================================
  Files                    122      122              
  Lines                  12164    12171       +7     
=====================================================
  Hits                    7264     7264              
- Misses                  4900     4907       +7     

Files with missing lines	Coverage Δ
...mpliance/gst_india/utils/gstr_1/gstr_1_download.py	19.11% <0.00%> (+0.27%)	⬆️
...iance/gst_india/doctype/gstr_1_beta/gstr_1_beta.py	0.00% <0.00%> (ø)
...mpliance/gst_india/api_classes/taxpayer_returns.py	51.11% <25.00%> (-3.66%)	⬇️
...st_india/doctype/gst_return_log/generate_gstr_1.py	14.53% <25.00%> (-0.09%)	⬇️

[india-compliance-bot]

🎉 This PR is included in version 15.15.0 🎉

The release is available on GitHub release

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