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

tools/assimp_cmd/ImageExtractor.cpp

@@ -228,7 +228,8 @@ int DoExport(const aiTexture* tx, FILE* p, const std::string& extension,
 // Implementation of the assimp extract utility
 int Assimp_Extract (const char* const* params, unsigned int num)
 {
-    const char* const invalid = "assimp extract: Invalid number of arguments. See \'assimp extract --help\'\n"; 
+    const char* const invalid = "assimp extract: Invalid number of arguments. See \'assimp extract --help\'\n";
+    // assimp extract in out [options]
     if (num < 1) {
         printf(invalid);
         return 1;
@@ -240,11 +241,7 @@ int Assimp_Extract (const char* const* params, unsigned int num)
         return 0;
     }
 
-    // asssimp extract in out [options]
-    if (num < 1) {
-        printf(invalid);
-        return 1;
-    }
+
 
     std::string in  = std::string(params[0]);
     std::string out = (num > 1 ? std::string(params[1]) : "-");