Fix IndexError when parsing FIB route keys without colon

Author: nnelluri-cisco

tests/common/fixtures/fib_utils.py

@@ -210,8 +210,11 @@ def get_fib_info(duthost, dut_cfg_facts, duts_mg_facts, testname=None):
             fib = json.load(fp)
             for k, v in list(fib.items()):
                 skip = False
-
-                prefix = k.split(':', 1)[1]
+                if ":" in k:
+                    prefix = k.split(':', 1)[1]
+                else:
+                    # Handle keys without colon
+                    continue
                 ifnames = v['value']['ifname'].split(',')
                 nh = v['value']['nexthop']