[fix] Fix segfault when applying SLAM
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By now, SLAM can only be applied on the fields Frame/Data which are polydatas and not on Trailingframe which is a multiBlock
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TrailingFrame is selected by default when loading a pcap so the first call to the SLAM filter without changing the selected field in Pipeline browser makes LV crash (SegFault).
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This commit allows to apply the filter on the Trailingframe input
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It checks the input in RequestData and extract the polydata from the multiblock if needed
Edited by Julia Sanchez