STYLE: use noexcept creation of InfoProxy and dereference as '*iproxy'

- this removes the 'magic' use of the exposed t_ member in favour
  of a generic dereference

applications/utilities/preProcessing/PDR/pdrFields/obstacles/PDRobstacle.C

@@ -654,7 +654,7 @@ Foam::Ostream& Foam::operator<<
     const InfoProxy<PDRobstacle>& iproxy
 )
 {
-    const PDRobstacle& obs = iproxy.t_;
+    const auto& obs = *iproxy;
 
     switch (obs.typeId)
     {

applications/utilities/preProcessing/PDR/pdrFields/obstacles/PDRobstacle.H

@@ -37,8 +37,8 @@ SourceFiles
 
 \*---------------------------------------------------------------------------*/
 
-#ifndef PDRobstacle_H
-#define PDRobstacle_H
+#ifndef Foam_PDRobstacle_H
+#define Foam_PDRobstacle_H
 
 #include "InfoProxy.H"
 #include "labelPair.H"
@@ -290,8 +290,9 @@ public:
 
     // IOstream Operators
 
-        //- Return info proxy.
-        InfoProxy<PDRobstacle> info() const
+        //- Return info proxy,
+        //- used to print information to a stream
+        InfoProxy<PDRobstacle> info() const noexcept
         {
             return *this;
         }