005-tilegrid/generate_full.py: readded else branch

Signed-off-by: Alessandro Comodi <acomodi@antmicro.com>

fuzzers/005-tilegrid/generate_full.py

@@ -310,6 +310,8 @@ def create_segment_for_int_lr(
             segtype=database[tile]["type"],
             verbose=verbose,
         )
+    else:
+        assert False, database[adjacent_tile]['type']
 
 
 def seg_base_addr_lr_INT(database, segments, tiles_by_grid, verbose=False):