Make the distinction between "exception conditions" and "completion
  conditions" (warning and "no data") as defined by the standard. The latter
  should not terminate a routine if no handler is found in the lexical scope.


mysql-test/r/sp.result:
  New test case for BUG#15231.
  Moved part of the test for BUG#7049 to the new testcase (since it was actually
  an example of 15231).
mysql-test/t/sp.test:
  New test case for BUG#15231.
  Moved part of the test for BUG#7049 to the new testcase (since it was actually
  an example of 15231).
sql/sp_rcontext.cc:
  Only search for matching condition handlers in caller's contexts if it's
  an exception conditition.