Detect mistakes in Adjacency Lists containing spaces in "{Cd, Cdd}".
Detect mistakes in Adjacency Lists containing spaces in "{Cd, Cdd}".

The error message that used to occur in this instance was not helpful
for debugging. Hopefully this extra check is not too costly in terms of time.
(We don't read adjacency lists all *that* often).

pierrelb/RMG-Py,nickvandewiele/RMG-Py,KEHANG/RMG-Py,KEHANG/RMG-Py,enochd/RMG-Py,comocheng/RMG-Py,enochd/RMG-Py,faribas/RMG-Py,comocheng/RMG-Py,nyee/RMG-Py,chatelak/RMG-Py,faribas/RMG-Py,pierrelb/RMG-Py,nyee/RMG-Py,chatelak/RMG-Py,nickvandewiele/RMG-Py