ENH: solutionControl - control dictionary e.g. PIMPLE now optional. See #1002

src/finiteVolume/cfdTools/general/solutionControl/pimpleControl/pimpleControl.C

@@ -39,7 +39,7 @@ void Foam::pimpleControl::read()
 {
     solutionControl::read(false);
 
-    const dictionary& pimpleDict = dict();
+    const dictionary pimpleDict(dict());
 
     solveFlow_ = pimpleDict.lookupOrDefault("solveFlow", true);
     nCorrPIMPLE_ = pimpleDict.lookupOrDefault<label>("nOuterCorrectors", 1);

src/finiteVolume/cfdTools/general/solutionControl/solutionControl/solutionControl.C

@@ -37,7 +37,7 @@ namespace Foam
 
 void Foam::solutionControl::read(const bool absTolOnly)
 {
-    const dictionary& solutionDict = this->dict();
+    const dictionary solutionDict(this->dict());
 
     // Read solution controls
     nNonOrthCorr_ =

src/finiteVolume/cfdTools/general/solutionControl/solutionControl/solutionControl.H

@@ -203,7 +203,7 @@ public:
         // Access
 
             //- Return the solution dictionary
-            inline const dictionary& dict() const;
+            inline const dictionary dict() const;
 
             //- Current corrector loop index
             inline label corr() const;

src/finiteVolume/cfdTools/general/solutionControl/solutionControl/solutionControlI.H

@@ -25,9 +25,9 @@ License
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-inline const Foam::dictionary& Foam::solutionControl::dict() const
+inline const Foam::dictionary Foam::solutionControl::dict() const
 {
-    return mesh_.solutionDict().subDict(algorithmName_);
+    return mesh_.solutionDict().subOrEmptyDict(algorithmName_);
 }