new files should not generate a blank image

Author: madhephaestus

src/main/java/com/neuronrobotics/bowlerstudio/scripting/cadoodle/CaDoodleFile.java

@@ -686,6 +686,8 @@ public File save() throws IOException {
 	private void setTimelineImage(List<CSG> currentState, int currentIndex2) throws IOException {
 		if(selfInternal==null)
 			return;
+		if(currentIndex2==0)
+			return;
 		File parent = selfInternal.getAbsoluteFile().getParentFile();
 		File imageCache = new File(parent.getAbsolutePath() + delim() + "timeline" + delim() + currentIndex2 + ".png");
 		File image = new File(parent.getAbsolutePath() + delim() + "snapshot.png");