Fix: Pin I/O label numbering

Merge commit ed8b3e0 from pull request Logisim-Ita#37 Matt345Fire/Logisim-Locale

Update Analyze.java

Logisim-Fork/src/main/java/com/cburch/logisim/circuit/Analyze.java

@@ -298,6 +298,7 @@ public int compare(Instance ac, Instance bc) {
 	 * throw new AnalyzeException.Conflict(); } } expressionMap.put(p2, e); } } } }
 	 */
 
+	// Metodo che controlla il nome delle etichette (specialmente per l'analizza circuito)
 	private static String toValidLabel(String label) {
 		if (label == null)
 			return null;
@@ -331,9 +332,12 @@ private static String toValidLabel(String label) {
 			}
 		}
 		if (end != null && ret.length() > 0)
-			ret.append(end.toString());
-		if (ret.length() == 0)
+			ret.append(end);
+		if (ret.length() == 0 && end != null) {
+			return end.toString();
+		} else if(ret.length() == 0) {
 			return null;
+		}
 		return ret.toString();
 	}