BUGFIX: Handling unigrid case in FillMetaData

Added handling of the case where there is only a single
grid, in which case the number of levels is zero. Hence,
the vector that holds a counter for the number of blocks
at each level must be allocated with numLevels+1 elements.

AMR/vtkAMREnzoReader.cxx

@@ -329,7 +329,7 @@ int vtkAMREnzoReader::FillMetaData( vtkHierarchicalBoxDataSet *metadata )
 
   this->Internal->ReadMetaData();
   std::vector< int > b2level;
-  b2level.resize( this->Internal->NumberOfLevels, 0 );
+  b2level.resize( this->Internal->NumberOfLevels+1, 0 );
 
   // this->Internal->Blocks includes a pseudo block -- the root as block #0
   for( int i=0; i < this->Internal->NumberOfBlocks; ++i )

AMR/vtkAMRFlashReader.cxx

@@ -155,7 +155,7 @@ int vtkAMRFlashReader::FillMetaData( vtkHierarchicalBoxDataSet *metadata )
   this->Internal->ReadMetaData();
 
   std::vector< int > b2level;
-  b2level.resize( this->Internal->NumberOfLevels, 0 );
+  b2level.resize( this->Internal->NumberOfLevels+1, 0 );
 
   for( int i=0; i < this->Internal->NumberOfBlocks; ++i )
     {