fixed pobug in ofToString when passing an empty vector. i suppose thi…

…s is where people usually use boost or poco to cover all the bases.

libs/openFrameworks/utils/ofUtils.h

@@ -92,10 +92,13 @@ string ofToString(const vector<T>& values) {
 	stringstream out;
 	int n = values.size();
 	out << "{";
-	for(int i = 0; i < n - 1; i++) {
-		out << values[i] << ", ";
+	if(n > 0) {
+		for(int i = 0; i < n - 1; i++) {
+			out << values[i] << ", ";
+		}
+		out << values[n - 1];
 	}
-	out << values[n - 1] << "}";
+	cout << "}";
 	return out.str();
 }