BUG: sampledSet : handling empty sets

src/sampling/sampledSet/midPoint/midPointSet.C

@@ -53,7 +53,7 @@ void Foam::midPointSet::genSamples()
 
     label sampleI = 0;
 
-    while(true)
+    while(true && size()>0)
     {
         // calculate midpoint between sampleI and sampleI+1 (if in same segment)
         while

src/sampling/sampledSet/midPointAndFace/midPointAndFaceSet.C

@@ -55,7 +55,7 @@ void Foam::midPointAndFaceSet::genSamples()
 
     label sampleI = 0;
 
-    while(true)
+    while(true && size()>0)
     {
         // sampleI is start of segment
 

src/sampling/sampledSet/sampledSets/sampledSets.C

@@ -96,6 +96,14 @@ void Foam::sampledSets::combineSampledSets
             )
         );
 
+
+        if (Pstream::master() && allCurveDist.size() == 0)
+        {
+            WarningIn("sampledSets::combineSampledSets(..)")
+                << "Sample set " << samplePts.name()
+                << " has zero points." << endl;
+        }
+
         // Sort curveDist and use to fill masterSamplePts
         SortableList<scalar> sortedDist(allCurveDist);
         indexSets[setI] = sortedDist.indices();