BlenderDNA.h:

* Fix rethrow that would crash the program.
* QUESTION: am I throwing the right exception here.

COBLoader:
* catch exception by const ref
* fix equality checks using strncmp taht weren't actually checking equality

FBXMaterial: Catch exception by const ref (+ Debug log that it's done so)

FBXConverter: Rename local variables to avoid shadowing parameter

ImageExtractor: Remove duplicated/unreachable code

FBXConverter: Another shadowed variable fix

MD5Loader: 2 shadowed variables

IRRLoader: shadowed parameter

StepFileReader.cpp: Shadowed parameter

IRRLoader: remove empty else statement

STLExporter: Throw error instead of silently ignoring unimplemented option

Misc empty blocks removed or debug logging added

code/D3MFOpcPackage.cpp

@@ -476,8 +476,11 @@ D3MFOpcPackage::D3MFOpcPackage(IOSystem* pIOHandler, const std::string& rFile)
             mZipArchive->Close( fileStream );
 
         } else if( file == D3MF::XmlTag::CONTENT_TYPES_ARCHIVE) {
-
+            ASSIMP_LOG_WARN_F("Ignored file of unsupported type CONTENT_TYPES_ARCHIVES",file);
+        } else {
+            ASSIMP_LOG_WARN_F("Ignored file of unknown type: ",file);
         }
+
     }
 }