BUG: face: Revert commit 51db019b and add special test for face of size 1

applications/test/Circulator/Test-Circulator.C

@@ -131,6 +131,10 @@ int main(int argc, char *argv[])
     Info<< "Compare " << face1 << " and " << face1
         << " Match = " << face::compare(face1, face1) << endl;
 
+    face face2(identity(1)+1);
+    Info<< "Compare " << face1 << " and " << face2
+        << " Match = " << face::compare(face1, face2) << endl;
+
     Info<< nl << nl << "Zero face" << nl << endl;
 
     face fZero;

src/OpenFOAM/meshes/meshShapes/face/face.C

@@ -318,6 +318,17 @@ int Foam::face::compare(const face& a, const face& b)
     {
         return 0;
     }
+    else if (sizeA == 1)
+    {
+        if (a[0] == b[0])
+        {
+            return 1;
+        }
+        else
+        {
+            return 0;
+        }
+    }
 
     const_circulator<face> aCirc(a);
     const_circulator<face> bCirc(b);
@@ -338,10 +349,10 @@ int Foam::face::compare(const face& a, const face& b)
 
     // If the circulator has stopped then faces a and b do not share a matching
     // point. Doesn't work on matching, single element face.
-    //if (!bCirc.circulate())
-    //{
-    //    return 0;
-    //}
+    if (!bCirc.circulate())
+    {
+        return 0;
+    }
 
     // Look forwards around the faces for a match
     do