Fix several coverity issues:

* CID 350617: Dereference after null check
* CID 350585: Out-of-bounds read
* CID 350624: Resource leak
* CID 332701: Uncaught exception
* CID 350642: Uninitialized scalar field
* CID 350590: Uninitialized scalar field
* CID 350629: Uninitialized scalar variable
* CID 350602: Uninitialized scalar variable
* CID 350564: Uninitialized scalar variable
* CID 350548: Uninitialized scalar variable

src/App/Material.cpp

@@ -36,17 +36,23 @@ using namespace App;
 // Material
 //===========================================================================
 Material::Material()
+  : shininess{0.2000f}
+  , transparency{}
 {
     setType(STEEL);
     setType(USER_DEFINED);
 }
 
 Material::Material(const char* MatName)
+  : shininess{0.2000f}
+  , transparency{}
 {
     set(MatName);
 }
 
 Material::Material(const MaterialType MatType)
+  : shininess{0.2000f}
+  , transparency{}
 {
     setType(MatType);
 }