Remove an assert that no longer appears necessary
Remove an assert that no longer appears necessary

The code after the assert appears to handle the case that the assert
was meant to prevent.

cryos/tomviz,mathturtle/tomviz,OpenChemistry/tomviz,cryos/tomviz,cryos/tomviz,OpenChemistry/tomviz,mathturtle/tomviz,mathturtle/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz