Modified the LIONESS R code to disallow PANDA inference unless either a PPI or motif are provided

[taraeicher]

Modified the LIONESS R code to disallow PANDA inference unless either a PPI or motif are provided

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 40.02%. Comparing base (ecb7ec1) to head (f128617).
Report is 2 commits behind head on devel.

Files with missing lines	Patch %	Lines
R/LIONESS.R	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #333      +/-   ##
==========================================
- Coverage   40.03%   40.02%   -0.01%     
==========================================
  Files          25       25              
  Lines        3407     3410       +3     
==========================================
+ Hits         1364     1365       +1     
- Misses       2043     2045       +2     

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