safer paste operation

Author: madhephaestus

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

@@ -56,8 +56,10 @@ public ArrayList<CSG> process(CSG ic, int depth) {
 			CSG source =  CaDoodleFile.getByName(back, from);
 			if (source.isGroupResult()) {
 				ArrayList<String> c = constituants(back, from);
-				if(c.size()<1)
-					throw new RuntimeException("A group result must have at least 1 constituants!");
+				if(c.size()<1) {
+					new RuntimeException("A group result must have at least 1 constituants!").printStackTrace();;
+					continue;
+				}
 				String newGroupName =  CaDoodleFile.getByName(back, cpMap.get(from)).getName();
 				for (String s : c) {
 					CSG dest =  CaDoodleFile.getByName(back, s);