Fix errors and warnings when importing Gst with gst-python >= 1.5.2 #1433
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With gst-python >= 1.5.2, a NotInitialized exception is thrown if Gst.is_initialized is called before Gst.init. This removes the Gst.is_initialized check, as Gst.init should be a noop if run again after the first call. This also adds an argument to Gst.init as gst-python >= 1.5.2 requires that as well.
Additionally, after fixing that, I got some warnings when importing GstPbutils before calling Gst.init, so that import is moved below the init, which removed the warnings.
This fixes #1432.