Fix failing modules lint test

[ErikDanielsson]

The main_nf modules lint tests was failing with errors when the process section of a module was missing, as reported in #1235. I added checks for that process definition exist before proceeding the rest of the lint tests. In addition, the failing tests for local modules were not reported at all. They are now reported as warnings.

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #1243 (1acbca3) into dev (bc8e01c) will decrease coverage by 0.01%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##              dev    #1243      +/-   ##
==========================================
- Coverage   67.54%   67.53%   -0.02%     
==========================================
  Files          50       50              
  Lines        5611     5615       +4     
==========================================
+ Hits         3790     3792       +2     
- Misses       1821     1823       +2     

Impacted Files	Coverage Δ
nf_core/modules/lint/main_nf.py	81.87% <50.00%> (-0.88%)	⬇️
nf_core/modules/lint/__init__.py	84.18% <100.00%> (ø)

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[JoseEspinosa]

Just found the issue #1235 and the solution is already implemented on this PR 😍
I tested locally and it worked. Thanks!
Was going to approve but pytest is failing...

[ewels]

I think that the CI failure was a temporary random thing.

Merged in upstream changes so tests now rerunning. I'm assuming that they'll pass now, and this already has a ✅ review so will set to auto-merge when the finish (if passing).

[grst]

This should have automatically been merged a while ago