COMP: fvMesh: add hasDb() member

src/finiteArea/faMesh/faMesh.C

@@ -1000,6 +1000,12 @@ Foam::label& Foam::faMesh::comm()
 }
 
 
+bool Foam::faMesh::hasDb() const
+{
+    return true;
+}
+
+
 const Foam::objectRegistry& Foam::faMesh::thisDb() const
 {
     return mesh().thisDb();

src/finiteArea/faMesh/faMesh.H

@@ -405,6 +405,9 @@ public:
 
         // Access
 
+            //- Return true if thisDb() is a valid DB
+            virtual bool hasDb() const;
+
             //- Return reference to the mesh database
             virtual const objectRegistry& thisDb() const;