Changed mysql-test to print warnings for not existing table to DROP TABLE

Cleaned up test; Removed wrong DROP TABLE commands and use standard table and database names.
changed store_warning() -> push_warning_print()

mysql-test/t/empty_table.test

@@ -2,7 +2,10 @@
 # Some special cases with empty tables
 #
 
+--disable_warnings
 drop table if exists t1;
+--enable_warnings
+
 create table t1 (nr int(5) not null auto_increment,b blob,str char(10), primary key (nr));
 select count(*) from t1;
 select * from t1;