Fixes Bears-R-Us#2648: Fix empty bounding box error (Bears-R-Us#3651)

This PR (closes Bears-R-Us#2648) fixes empty bounding box error

Co-authored-by: Tess Hayes <stress-tess@users.noreply.github.com>

src/SymArrayDmap.chpl

@@ -31,7 +31,13 @@ module SymArrayDmap {
           return dom;
         }
         when Dmap.blockDist {
-          return blockDist.createDomain(dom);
+          if dom.size > 0 {
+              return blockDist.createDomain(dom);
+          }
+          // fix the annoyance about boundingBox being empty
+          else {
+            return dom dmapped new blockDist(boundingBox=dom.expand(1));
+          }
         }
       }
     }