Fixing code coverage

[gangatp]

using --ignore-errors inconsistent in lcov command

https://giters.com/linux-test-project/lcov/issues/220

[codecov]

Codecov Report

Attention: 161 lines in your changes are missing coverage. Please review.

Comparison is base (791c35c) 72.80% compared to head (5cb7ce2) 69.74%.
Report is 24 commits behind head on develop.

Files	Patch %	Lines
Autogenerated/Bindings/Cpp/lib3mf_implicit.hpp	71.33%	86 Missing ⚠️
Autogenerated/Source/lib3mf_types.hpp	20.83%	38 Missing ⚠️
Source/API/lib3mf_model.cpp	48.48%	17 Missing ⚠️
Autogenerated/Source/lib3mf_interfaces.hpp	94.17%	6 Missing ⚠️
Source/API/lib3mf_basematerialgroupiterator.cpp	0.00%	2 Missing ⚠️
Source/API/lib3mf_colorgroupiterator.cpp	0.00%	2 Missing ⚠️
Source/API/lib3mf_compositematerialsiterator.cpp	0.00%	2 Missing ⚠️
Source/API/lib3mf_multipropertygroupiterator.cpp	0.00%	2 Missing ⚠️
Source/API/lib3mf_texture2dgroupiterator.cpp	0.00%	2 Missing ⚠️
Source/API/lib3mf_texture2diterator.cpp	0.00%	2 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #330      +/-   ##
===========================================
- Coverage    72.80%   69.74%   -3.07%     
===========================================
  Files          418      271     -147     
  Lines        23298    29758    +6460     
===========================================
+ Hits         16963    20755    +3792     
- Misses        6335     9003    +2668     

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