Duplicate fasta headers cause assertion error

[lmfaber]

Causes this error when creating the read graph from the equivalence class:

2019-11-04 17:14:49 [INFO]: Perform clustering with HDBSCAN. (min_cluster_size: 2)
2019-11-04 17:14:51 [INFO]: Salmon mapping...
2019-11-04 17:15:11 [INFO]: Build full graph...
Traceback (most recent call last):
  File "/mnt/prostlocal/lasse/miniconda3/envs/test_karma/bin/karma.py", line 208, in <module>
    full_graph = ReadGraph.from_equivalence_classes(eqc_file, sequences)
  File "/data/prostlocal/lasse/miniconda3/envs/test_karma/bin/read_graph.py", line 78, in from_equivalence_classes
    assert no_of_contigs == len(max_number_of_mapped_reads.keys())
AssertionError

It would be nice to implement a check for this when reading the fasta file.