Add error handling strategies for nextflow processes

[evanroyrees]

Add error handling strategies for nextflow processes

1. embed_kmers.nf
   - errorStrategy {exitCode in 153 ? "ignore" : "terminate" }
   - Not enough contigs to perform embedding with current parameter settings
2. binning.nf
   - errorStrategy { task.exitStatus in 204 ? 'ignore' : 'terminate' }
   - No markers were annotated for contigs in the table
3. unclustered_recruitment.nf
   - errorStrategy { task.exitStatus in 204 ? 'ignore' : 'terminate' }
   - No markers were annotated for contigs in the table
4. markers.nf
   - errorStrategy { task.exitStatus in 204 ? 'ignore' : 'terminate' }
   - No markers in kingdom.hmmscan.tsv pass cutoff thresholds

[codecov]

Codecov Report

Merging #231 (3c1874b) into dev (1b70a6a) will increase coverage by 0.40%.
The diff coverage is 68.75%.

@@            Coverage Diff             @@
##              dev     #231      +/-   ##
==========================================
+ Coverage   27.23%   27.64%   +0.40%     
==========================================
  Files          45       45              
  Lines        5331     5336       +5     
==========================================
+ Hits         1452     1475      +23     
+ Misses       3879     3861      -18     

Flag	Coverage Δ
unittests	27.64% <68.75%> (+0.40%)	⬆️

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

Impacted Files	Coverage Δ
autometa/common/markers.py	90.66% <50.00%> (-3.62%)	⬇️
autometa/binning/recursive_dbscan.py	86.47% <80.00%> (+2.04%)	⬆️
autometa/binning/unclustered_recruitment.py	91.93% <0.00%> (+8.60%)	⬆️

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