def copyChunkFrom(self, regionFile, cx, cz):
        """
        Silently fails if regionFile does not contain the requested chunk.
        """
        try:
            data, format = regionFile._readChunk(cx, cz)
            self._saveChunk(cx, cz, data, format)
        except ChunkNotPresent:
            pass

        Silently fails if regionFile does not contain the requested chunk.
        
pymclevel/regionfile.py