bug: paired-heatmap top-k-microbes fails when top microbes are not found in ranks

[nbokulich]

Error reported in QIIME 2 forum

The issue is at these lines:

mmvec/mmvec/heatmap.py

Lines 199 to 201 in ec082d2

	top_metabolites = dict.fromkeys(m for x in [ranks.loc[f].sort_values(
	ascending=False)[:top_k_metabolites].index
	for f in features] for m in x).keys()

This results in a KeyError if any of the features (microbes) are missing from the ranks table.

either those lines should be amended to grab only features that are present in ranks, or better yet ranks and microbes_table should be subsetted to keep the intersection somewhere before this line:

mmvec/mmvec/heatmap.py

Line 175 in ec082d2

if top_k_microbes is not None: