src/QGst/caps.cpp use gst_caps_new_empty_simple
src/QGst/caps.cpp use gst_caps_new_empty_simple

the new gst_caps_new_simple didn't like being called
with zero caps parameters.

knuesel/qt-gstreamer,GStreamer/qt-gstreamer,tswindell/qt-gstreamer,GStreamer/qt-gstreamer,nasserGanjali/QtGStreamer,nasserGanjali/QtGStreamer,detrout/qt-gstreamer,dejunk/gstreamer,dejunk/gstreamer,iperry/qt-gstreamer,knuesel/qt-gstreamer,nasserGanjali/QtGStreamer,dejunk/gstreamer,detrout/qt-gstreamer,iperry/qt-gstreamer,tswindell/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,knuesel/qt-gstreamer,GStreamer/qt-gstreamer,tswindell/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,detrout/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,iperry/qt-gstreamer