Allow an empty password when adding a new MySQL user. (#3445)

database/mysql/mysql_user.py

@@ -32,7 +32,7 @@ options:
     required: true
   password:
     description:
-      - set the user's password. (Required when adding a user)
+      - set the user's password.
     required: false
     default: null
   encrypted:
@@ -232,6 +232,8 @@ def user_add(cursor, user, host, host_all, password, encrypted, new_priv, check_
         cursor.execute("CREATE USER %s@%s IDENTIFIED BY PASSWORD %s", (user,host,password))
     elif password and not encrypted:
         cursor.execute("CREATE USER %s@%s IDENTIFIED BY %s", (user,host,password))
+    else:
+        cursor.execute("CREATE USER %s@%s", (user,host))
 
     if new_priv is not None:
         for db_table, priv in new_priv.iteritems():
@@ -559,8 +561,6 @@ def main():
             except (SQLParseError, InvalidPrivsError, MySQLdb.Error), e:
                 module.fail_json(msg=str(e))
         else:
-            if password is None:
-                module.fail_json(msg="password parameter required when adding a user")
             if host_all:
                 module.fail_json(msg="host_all parameter cannot be used when adding a user")
             try: