Define the utility path lable, and help message for the Greenplum

database server, shown in the preferences dialog.

Also, fixed the issue, when server type is not defined in the
DEFAULT_BINARY_PATHS, in the configuration.

web/pgadmin/browser/server_groups/servers/gpdb.py

@@ -12,6 +12,12 @@ from pgadmin.browser.server_groups.servers.types import ServerType
 
 
 class GPDB(ServerType):
+    UTILITY_PATH_LABEL = gettext("Greenplum Database Binary Path")
+    UTILITY_PATH_HELP = gettext(
+        "Path to the directory containing the Greenplum Database utility"
+        " programs (pg_dump, pg_restore etc)."
+    )
+
     def instanceOf(self, ver):
         return "Greenplum Database" in ver
 

web/pgadmin/browser/server_groups/servers/types.py

@@ -54,7 +54,10 @@ class ServerType(object):
 
         for key in cls.registry:
             st = cls.registry[key]
-            default_path = config.DEFAULT_BINARY_PATHS[st.stype] or ""
+            default_path = (
+                config.DEFAULT_BINARY_PATHS[st.stype] if st.stype in
+                config.DEFAULT_BINARY_PATHS else ""
+            ) or ""
 
             st.utility_path = paths.register(
                 'bin_paths', st.stype + '_bin_dir',