deviceproviderfactory: ignore empty classes
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@ -499,7 +499,7 @@ gst_device_provider_factory_has_classesv (GstDeviceProviderFactory * factory,
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const gchar *found;
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guint len;
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if (classes[0] == NULL)
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if (classes[0][0] == '\0')
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continue;
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found = strstr (klass, classes[0]);
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