Python3 fetch element-error before adding it to pipeline

[Ole]

Hello, I am writing an application in python3x where I use gdkpixbufoverlay. 
It is possible that I get non-valid filenames or corrupt png's.

I need a hint how or where to fetch an element-error when the element is not
currently added to the pipe. I can fetch errors from the pipeline via
.get_bus(). But what I want is only to add the element when I did not got an
error trying to load the image.









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