Some bugs with common tables and columns check

[kobyan]

1. If the common tables check is performed without a schema name (in the current schema), then the log will output the table names with None as the schema name

[INFO] fetched tables: 'None.news', 'None.usuario'

2. If several table names are specified for column definition (-T news,usuario --columns), then in the definition method via information_schema sqlmap tries to get columns first for one table, then for the next one, but in the common columns check method sqlmap tries to check columns for the table news,usuario

[PAYLOAD] -6177'Or exisTs(SeleCT rid fROm **redacted**.`news,usuario`)aND'1'='1