Issue #221 Replace the ERROR with a WARNING and proceed when a passwo…

…rd is missing. This allows cloud-users to continue without a password.

METdbLoad/ush/read_load_xml.py

@@ -239,10 +239,10 @@ def read_db_connect(self, root):
                 root.xpath('connection')[0].xpath('user')[0].text
             self.connection['db_password'] = \
                 root.xpath('connection')[0].xpath('password')[0].text
+            # For AWS users, an empty password is acceptable.  
             if ((not self.connection['db_user']) or
                     (not self.connection['db_password'])):
-                logging.error("!!! XML must include user and password tags")
-                raise NameError("Missing required user or password tag or both")
+                logging.warning("!!! XML expecting user and password tags")
 
             if root.xpath('connection')[0].xpath('management_system'):
                 self.connection['db_management_system'] = \