added sanity check to csv

refactoring for wifi models
adjusted obj/mtl parsing

data/csv.h

@@ -5,6 +5,7 @@
 #include <string>
 #include <fstream>
 #include "../misc/Debug.h"
+#include "../Exception.h"
 
 class CSV {
 
@@ -54,6 +55,12 @@ public:
 			Doc doc;
 
 			std::ifstream inp(file.c_str());
+
+			// sanity check
+			if (!inp) {
+				throw Exception("failed to open file: " + file);
+			}
+
 			int rowCnt = 0;
 			std::string line;