stdout not returned if stderr is populated by matlab

[brunobeltran]

m = pymatbridge.Matlab()
m.start()
m.run_code("""for i=1:10; disp(i); if i==5; error('a'); end; end;""")

returns only

{'content': {'stdout': 'a'}, 'result': '', 'success': False}

When it should return something like

{'content': {'stderr': 'a', 'stdout': '1\n2\n3\n4\n5\na'}, 'result': '', 'success': False}