gdb

gdb
	* varobj.c (update_dynamic_varobj_children): Properly handle
	errors from iterator.
gdb/testsuite
	* gdb.python/py-prettyprint.py (exception_flag): New global.
	(NoStringContainerPrinter._iterator.next): Check it.
	* gdb.python/py-prettyprint.c (main): New variable nstype2.
	* gdb.python/py-mi.exp: Set exception_flag and do more tests.