fixed uncaught exception if chnagelog doesn't contain versioncode

src/de/deadlocker8/budgetmaster/logic/updater/Updater.java

@@ -105,7 +105,7 @@ public class Updater
         return parser.parse(data.toString()).getAsJsonObject();
 	}
 	
-	public String getChangelog(int versionCode) throws IOException
+	public String getChangelog(int versionCode) throws Exception
 	{		
 		JsonObject changelogJSON = getChangelogFromURL();
 		

src/de/deadlocker8/budgetmaster/resources/changelog.json

@@ -6,5 +6,6 @@
     "5":"-bugfixes\n-reports can now include a budget calculation\n",
     "6":"Fixed critical bug that prevents repeating payments from being correctly updated for future months.\n",
     "7":"-localized all strings into external file\n-added english localization\n-added language chooser to settings\n-remove javafx.Color from server --> server should no run on linux with normal jdk\n-bugfixes:\n  -[FIXED] - report budget is calculated incorrectly\n  -[FIXED] - refresh after database imprt/delete missing\n  -[FIXED] - critical bug concerning repeating payments\n",
-    "8":"bugfixes:\n  -broken month chart if january is selected\n  -wrong footer in month report\n  -wrong initial file name for month report\n  -server start failure\n"
+    "8":"bugfixes:\n  -broken month chart if january is selected\n  -wrong footer in month report\n  -wrong initial file name for month report\n  -server start failure\n",
+	"9":""
 }
\ No newline at end of file

src/de/deadlocker8/budgetmaster/ui/controller/Controller.java

@@ -410,7 +410,7 @@ public class Controller
 				}
 			});
 		}		
-		catch(IOException e)
+		catch(Exception e)
 		{
 			Logger.error(e);
 			AlertGenerator.showAlert(AlertType.ERROR,