Fix/nextflow concurrency

[Grifs]

Describe your changes

Define 2 variables before a code branch
Fix an additonal similar issue

Related issue(s)

Implements the code mentioned in #605 (comment)

Type of Change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New functionality (non-breaking change which adds functionality)
• Major change (non-breaking change which modifies existing functionality)
• Minor change (non-breaking change which does not modify existing functionality)
• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update

Checklist

Requirements:

• I have read the CONTRIBUTING doc.
• I have performed a self-review of my code by checking the "Changed Files" tab.
• My code follows the code style of this project.

Tests:

• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

Documentation:

• Proposed changes are described in the CHANGELOG.md.
• I have updated the documentation accordingly.

Test Environment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.76%. Comparing base (9820541) to head (2ef86a9).
Report is 1 commits behind head on develop_0_8.

❗ Current head 2ef86a9 differs from pull request most recent head 58a0047. Consider uploading reports for the commit 58a0047 to get more accurate results

Additional details and impacted files

@@               Coverage Diff               @@
##           develop_0_8     #669      +/-   ##
===============================================
- Coverage        88.78%   88.76%   -0.03%     
===============================================
  Files              120      120              
  Lines             3648     3630      -18     
  Branches           527      526       -1     
===============================================
- Hits              3239     3222      -17     
+ Misses             409      408       -1     

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[rcannood]

Let's go