Checks if single-version mnemonic is in all_sources

This MR addresses #42 (closed) by adding a test on each mnemonic for checking if its source is present in the DataCollection all_sources.

src/toolbox_scs/mnemonics_machinery.py

@@ -10,7 +10,6 @@ import logging
 
 from .constants import mnemonics as _mnemonics
 from extra_data import open_run
-from numpy import s_
 __all__ = [
     'mnemonics_for_run'
 ]
@@ -74,7 +73,9 @@ def mnemo_version_index(run, mnemonic):
 
     """
     if len(_mnemonics[mnemonic]) == 1:
-        return 0
+        if _mnemonics[mnemonic][0]['source'] in run.all_sources:
+            return 0
+        return -1
     for i, v in enumerate(_mnemonics[mnemonic]):
         if (v['source'] in run.all_sources and
                 v['key'] in run.keys_for_source(v['source'])):