logilab-astng #119843 Quick fix for validating PyQt PyQt4.QtCore [open]

See also
http://www.logilab.org/ticket/57299

Quick, dirty and possibly not a definitive solution is to add an explicit

except TypeError:
if name == 'QSignalMapper':
modname = 'PyQt4.QtCore'
attach_import_node(node, modname, name)
return True

logilab/astng/raw_building.py : imported_member