Terminate before results assembly if edge update causes broken chain #185
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Addresses biothings/biothings_explorer#796
When a QEdge is updated it can cause other QEdges to update such that they keep no edges (due to a lack of overlapping nodes). This was previously checked for, but apparently not handled, as execution would continue to results assembly, where errors would occur.
This PR causes BTE to correctly terminate query execution (with an appropriate log) in these cases.