Added an assertion in ExtCell.c to force a fault if the technology

is NULL when writing a .ext file;  this should help with tracking
down an obscure bug.

VERSION

@@ -1 +1 @@
-8.3.46
+8.3.47

extract/ExtCell.c

@@ -308,6 +308,8 @@ extHeader(def, f)
     bool propfound;
     char *propvalue;
 
+    ASSERT(DBTechName != NULL, "extHeader");
+
     /* Output a timestamp (should be first) */
     fprintf(f, "timestamp %d\n", def->cd_timestamp);