To fix webconfig crash while using testutility with empty multipart bin

[sadhyama]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.65%. Comparing base (2cc2a87) to head (c846590).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/webcfg_multipart.c	28.57%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
- Coverage   80.66%   80.65%   -0.01%     
==========================================
  Files          38       38              
  Lines       11277    11277              
  Branches     1111     1111              
==========================================
- Hits         9097     9096       -1     
- Misses       1167     1168       +1     
  Partials     1013     1013              

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