tools/pydfu: Raise exception when uploading binary without address.

Signed-off-by: Tadeas Pilar <tadeas.pilar@prusa3d.cz>

tools/pydfu.py

@@ -624,7 +624,7 @@ def main():
     if args.path:
         if str(args.path).endswith(".bin"):
             if not args.address:
-                return
+                raise ValueError("Address must be specified using -a when uploading binary")
             addr = str(args.address)
             if addr.startswith("0x") or addr.startswith("0X"):
                 addr = int(addr, 16)