Fix: divide by zero

src/main/java/com/sheepit/client/DownloadProgress.java

@@ -43,6 +43,8 @@ public class DownloadProgress {
 	
 	public synchronized void addProgress(long progress) {
 		this.partial += progress;
-		gui.status(String.format(this.guiPattern + " %.0f %%", 100.0f * this.partial / this.total));
+		if (this.total != 0) {
+			gui.status(String.format(this.guiPattern + " %.0f %%", 100.0f * this.partial / this.total));
+		}
 	}
 }