BUG: sixDoFRigidBodyMotion. Was not skipping constraints and

restraints when there were none read.  Was not a problem for
restraints, but constraints were stopping the code on a maxIteration
trap, as it defaults to zero.

src/postProcessing/functionObjects/forces/pointPatchFields/derived/sixDoFRigidBodyMotion/sixDoFRigidBodyMotion.C

@@ -30,6 +30,11 @@ License
 
 void Foam::sixDoFRigidBodyMotion::applyRestraints()
 {
+    if (restraints_.size() == 0)
+    {
+        return;
+    }
+
     if (Pstream::master())
     {
         forAll(restraints_, rI)
@@ -57,6 +62,11 @@ void Foam::sixDoFRigidBodyMotion::applyRestraints()
 
 void Foam::sixDoFRigidBodyMotion::applyConstraints(scalar deltaT)
 {
+    if (constraints_.size() == 0)
+    {
+        return;
+    }
+
     if (Pstream::master())
     {
         label iter = 0;

src/postProcessing/functionObjects/forces/pointPatchFields/derived/sixDoFRigidBodyMotion/sixDoFRigidBodyMotionConstraint/sixDoFRigidBodyMotionConstraint/sixDoFRigidBodyMotionConstraint.C

@@ -69,6 +69,9 @@ bool Foam::sixDoFRigidBodyMotionConstraint::read
     const dictionary& sDoFRBMCDict
 )
 {
+    name_ =
+        fileName(sDoFRBMCDict.name().name()).components(token::COLON).last();
+
     tolerance_ = (readScalar(sDoFRBMCDict.lookup("tolerance")));
 
     relaxationFactor_ = sDoFRBMCDict.lookupOrDefault<scalar>

src/postProcessing/functionObjects/forces/pointPatchFields/derived/sixDoFRigidBodyMotion/sixDoFRigidBodyMotionRestraint/sixDoFRigidBodyMotionRestraint/sixDoFRigidBodyMotionRestraint.C

@@ -64,6 +64,9 @@ bool Foam::sixDoFRigidBodyMotionRestraint::read
     const dictionary& sDoFRBMRDict
 )
 {
+    name_ =
+        fileName(sDoFRBMRDict.name().name()).components(token::COLON).last();
+
     sDoFRBMRCoeffs_ = sDoFRBMRDict.subDict(type() + "Coeffs");
 
     return true;