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Check length of weight sums when merging the NanoAOD Runs tree

Pieter David requested to merge piedavid/bamboo:protectunequalnofweightsums into master

@fbury ran into the issue that the number of PDF weights is not always the same (there are a few similar bugs, but I'm not sure this one has been reported already), which would cause an exception and wrong normalisation (because plotIt assumes 1 then).

With this change an error is printed, but the sums that are there are combined still (we mostly care about the genEventSumw branch, which is consistent).

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