When executing drop view statement on the master, the statement is not written into bin-log if any error occurs, this could cause master slave inconsistence if any view has been dropped. 

If some error occured and no view has been dropped, don't bin-log the statement, if at least one view has been dropped the query is bin-logged possible with an error.


sql/sql_view.cc:
  If at least one view has been dropped the query is bin-logged possible with an error.
mysql-test/suite/rpl/r/rpl_drop_view.result:
  Add test result for bug#30998
mysql-test/suite/rpl/t/rpl_drop_view.test:
  Add test case for bug#30998