AETHER-3609: enodebd configuration / health status read fail

Change-Id: Ib5186b1b10c2a4f5232fefadcb73bcd0d8e09457
diff --git a/configuration/service_configs.py b/configuration/service_configs.py
index 44f89ea..65fd4a7 100644
--- a/configuration/service_configs.py
+++ b/configuration/service_configs.py
@@ -86,6 +86,9 @@
     """
 
     ret = dict()
+    if not os.path.exists(ENB_CONFIG_DIR):
+        return ret
+
     for fname in filter(lambda x: x.endswith(".yml"), os.listdir(ENB_CONFIG_DIR)):
         sn = fname.replace(".yml", "")
         cfg_file_name = os.path.join(ENB_CONFIG_DIR, fname)