Fix for dropping a table with frm file consisting of "junk"

mysql-test/r/show_check.result

@@ -512,6 +512,13 @@ t1	CREATE TABLE `t1` (
   KEY `c2` USING BTREE (`c2`)
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 DROP TABLE t1;
+flush tables;
+SHOW TABLE STATUS like 't1';
+Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
+t1	NULL	NULL	NULL	NULL	#	#	#	#	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Incorrect information in file: './test/t1.frm'
+show create table t1;
+ERROR HY000: Incorrect information in file: './test/t1.frm'
+drop table t1;
 CREATE TABLE txt1(a int);
 CREATE TABLE tyt2(a int);
 CREATE TABLE urkunde(a int);
@@ -557,10 +564,3 @@ DROP TABLE tyt2;
 DROP TABLE urkunde;
 SHOW TABLES FROM non_existing_database;
 ERROR 42000: Unknown database 'non_existing_database'
-flush tables;
-SHOW TABLE STATUS like 't1';
-Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
-t1	NULL	NULL	NULL	NULL	#	#	#	#	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Incorrect information in file: './test/t1.frm'
-show create table t1;
-ERROR HY000: Incorrect information in file: './test/t1.frm'
-drop table t1;

sql/sql_table.cc

@@ -273,7 +273,8 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
       *(end=fn_ext(path))=0;			// Remove extension for delete
       error= ha_delete_table(thd, table_type, path, table->table_name,
                              !dont_log_query);
-      if ((error == ENOENT || error == HA_ERR_NO_SUCH_TABLE) && if_exists)
+      if ((error == ENOENT || error == HA_ERR_NO_SUCH_TABLE) && 
+	  (if_exists || table_type == DB_TYPE_UNKNOWN))
 	error= 0;
       if (error == HA_ERR_ROW_IS_REFERENCED)
       {