Don't default to fromOldAdjacencyList when fromAdjacencyList function fails.
Don't default to fromOldAdjacencyList when fromAdjacencyList function fails.

The fromAdjacencyList function may be failing from other issues.  Rely on the
regex to detect old and intermediate style adjlists properly.

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