Reintroduce file check in instance load method

assimp/glow-extras/assimp/Importer.cc

@@ -24,6 +24,17 @@ glow::assimp::Importer::Importer() {}
 
 glow::SharedVertexArray glow::assimp::Importer::load(const std::string& filename)
 {
+	GLOW_ACTION();
+
+	using namespace assimp;
+
+	if (!std::ifstream(filename).good())
+	{
+		error() << "Error loading `" << filename << "' with Assimp.";
+		error() << "  File not found/not readable";
+		return nullptr;
+	}
+
     uint32_t flags = aiProcess_SortByPType;
 
     if (mTriangulate)

assimp/glow-extras/assimp/Importer.hh

@@ -156,7 +156,8 @@ public:
 	/// Each attribute gets their own buffer.
 	static SharedVertexArray LoadAndCreateMesh(std::string const& filename, uint32_t flags = importDefaultFlags);
 
-	/// Creates a VA from MeshData, requires OGL context and initialized GLOW on the same thread
+	/// Creates a VA from MeshData
+	/// Requires OGL context and initialized GLOW on the same thread
 	static SharedVertexArray CreateMeshFromData(const MeshData& data);
 
 	/// Loads MeshData from a given filename with the given importer flags