Corrected a minor error in ext2hier.c where views with no devices

and no ports are still supposed to be output as instances if they
have been marked as abstract views.  Such views were getting output
as cell definitions but not instanced, which although is irrelevant
for simulation, would potentially cause LVS errors.

VERSION

@@ -1 +1 @@
-8.3.614
+8.3.615