ZoltanDecomp: Check for no points on any processor during redistribution and throw a fatal error

Zoltan hangs if a processor has no points/cells during redistribution and
unfortunatel Zoltan can generate distributions in which one or processors has no
cells.

src/parallel/decompose/zoltanDecomp/zoltanDecomp.C

@@ -248,6 +248,14 @@ Foam::label Foam::zoltanDecomp::decompose
     List<label>& finalDecomp
 ) const
 {
+    if (Pstream::parRun() && !points.size())
+    {
+        Pout<< "No points on processor " << Pstream::myProcNo() << nl
+            << "    Zoltan cannot redistribute without points"
+               "on all processors." << endl;
+        FatalErrorInFunction << exit(FatalError);
+    }
+
     stringList args(1);
     args[0] = "zoltanDecomp";