message: Fixes a spin test that assumed the result of axom::allocate(0) was a nullptr
diff: @@ -394,7 +394,6 @@ void check_find3d( )
  {
  EXPECT_EQ( counts[ i ], 0 );
  }
  - EXPECT_TRUE( candidates == nullptr );
  axom::deallocate( offsets );
  axom::deallocate( candidates );
  @@ -491,7 +490,6 @@ void check_find2d( )
  {
  EXPECT_EQ( counts[ i ], 0 );
  }
  - EXPECT_TRUE( candidates == nullptr );
  axom::deallocate( offsets );
  axom::deallocate( candidates );
  @@ -560,13 +558,13 @@ void check_single_box2d( )
  xc[ 0 ] += 10.0; yc[ 0 ] += 10.0;
  bvh.find( offsets, counts, candidates, NUM_BOXES, xc, yc );
  EXPECT_EQ( counts[ 0 ], 0 );
  - EXPECT_TRUE( candidates == nullptr );
  axom::deallocate( xc );
  axom::deallocate( yc );
  axom::deallocate( boxes );
  axom::deallocate( offsets );
  axom::deallocate( counts );
  + axom::deallocate( candidates );
  axom::setDefaultAllocator( current_allocator );
  }
  @@ -629,7 +627,6 @@ void check_single_box3d( )
  xc[ 0 ] += 10.0; yc[ 0 ] += 10.0;
  bvh.find( offsets, counts, candidates, NUM_BOXES, xc, yc, zc );
  EXPECT_EQ( counts[ 0 ], 0 );
  - EXPECT_TRUE( candidates == nullptr );
  axom::deallocate( xc );
  axom::deallocate( yc );
  @@ -637,6 +634,7 @@ void check_single_box3d( )
  axom::deallocate( boxes );
  axom::deallocate( offsets );
  axom::deallocate( counts );
  + axom::deallocate( candidates );
  axom::setDefaultAllocator( current_allocator );
  }
  