- add missing initialization of several class members

- prefer check for empty() over check for size() in OptimizeGraph (empty() is guaranteed to be constant time, size() is not)
- fix a couple of incorrect indentations

code/ColladaLoader.cpp

@@ -81,7 +81,10 @@ static const aiImporterDesc desc = {
 // ------------------------------------------------------------------------------------------------
 // Constructor to be privately used by Importer
 ColladaLoader::ColladaLoader()
-: noSkeletonMesh(), ignoreUpDirection(false), mNodeNameCounter()
+    : noSkeletonMesh()
+    , ignoreUpDirection(false)
+    , invertTransparency(false)
+    , mNodeNameCounter()
 {}
 
 // ------------------------------------------------------------------------------------------------