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Fix segmentation fault in AMG if matrix of one rank is empty.

Markus Blatt requested to merge fix-amg-empty-matrix-on-one-proc into master

For this we need to mark a matrix without rows built in row_wise mode as built once the CreateIterator is constructed and correct the number of vertices for a Subgraph of a MatrixGraph with 0 vertices.

This should fix the segementatio fault Kumar is experiencing.

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