Improved TransformationFacade error handling

* ErrorHandler class created in 5859cb6 now caches all errors instead of pushing them to std::cerr
** cached errors are retrieved by TransformationFacade's "generate" member method
* test frontend pushes all errors to std::cerr
* FunctionTransform returns errors to the calling template as XML
** FunctionTransform test case demonstrates how one may test for successful transformation
* "generate" member method returns std::string vector wrapped in a std::unique_ptr
** this is used as a kind of optional pointer, as the std::unique_ptr instance only wraps a vector if errors where actually generated

1 files changed, 3 insertions, 1 deletions

diff --git a/src/support/include_entity_resolver.cc b/src/support/include_entity_resolver.cc
index 948a61b..e63a3c4 100644
--- a/src/support/include_entity_resolver.cc
+++ b/src/support/include_entity_resolver.cc
@@ -48,7 +48,9 @@ xercesc::InputSource* IncludeEntityResolver::resolveEntity(
 					*XercesStringGuard<XMLCh>((*resolvedPath).string())
 				);
 			} else {
-				return nullptr;
+				return new xercesc::LocalFileInputSource(
+					*XercesStringGuard<XMLCh>(*filePath)
+				);
 			}
 		} else {
 			return nullptr;