Fix #1 skip the chains line analyzing the ClaRNA output
Fix #1 skip the chains line analyzing the ClaRNA output

```
[mq] nm_1x9k_clx$        clarna_compare.py -iref 1x9k_rpr.pdb.outCR -ichk with_chain_renumber/1x9k_rnakbnm_decoy0091_amb_clx.pdb.outCR
['chains:', 'A', '2', '14', 'B', '2', '14', 'C', '15', '31', 'D', '32', '49']
Traceback (most recent call last):
  File "/home/mqapRNA/mqaprna_env/mqapRNA/lib/ClaRNA_play/clarna_compare.py", line 1055, in <module>
    anal_clarna.get_outdata()
  File "/home/mqapRNA/mqaprna_env/mqapRNA/lib/ClaRNA_play/clarna_compare.py", line 527, in get_outdata
    self.refdata = rdt.readData(self.refflnm)
  File "/home/mqapRNA/mqaprna_env/mqapRNA/lib/ClaRNA_play/clarna_compare.py", line 318, in readData
    v = self.reconstructDict(dlist[i])
  File "/home/mqapRNA/mqaprna_env/mqapRNA/lib/ClaRNA_play/clarna_compare.py", line 364, in reconstructDict
    v = {(sv[0], int(sv[1]), sv[2], int(sv[3])) : { sv[4]: (sv[5], sv[6])} }
ValueError: invalid literal for int() with base 10: 'A'
```

m4rx9/rna-pdb-tools,m4rx9/rna-pdb-tools