[RM] Add error handling for missing plugin tags in URDF parsing

[Mehul0x]

Added a try-catch block statement to check the validity of type_it in hardware interface parser. It returns an error signifying the missing plugin in either hardware or transmission element

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 89.23%. Comparing base (0d7bbfa) to head (a602514).

Files with missing lines	Patch %	Lines
hardware_interface/src/component_parser.cpp	0.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2138      +/-   ##
==========================================
- Coverage   89.25%   89.23%   -0.03%     
==========================================
  Files         139      139              
  Lines       15504    15508       +4     
  Branches     1318     1320       +2     
==========================================
  Hits        13838    13838              
- Misses       1161     1163       +2     
- Partials      505      507       +2     

Flag	Coverage Δ
unittests	89.23% <0.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
hardware_interface/src/component_parser.cpp	93.83% <0.00%> (-0.90%)	⬇️

... and 3 files with indirect coverage changes

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[christophfroehlich]

Thanks!