Replace underived exceptions with clean exit

Fix:

| TypeError: exceptions must be old-style classes or derived from BaseException, not NoneType

Closes: #702874

grml2usb

@@ -1052,7 +1052,8 @@ def copy_bootloader_files(iso_mount, target, grml_flavour):
         logging.critical("Fatal: file default.cfg could not be found.")
         logging.critical("Note:  this grml2usb version requires an ISO generated by grml-live >=0.9.24 ...")
         logging.critical("       ... either use grml releases >=2009.10 or switch to an older grml2usb version.")
-        raise
+        cleanup()
+        sys.exit(1)
 
     if not os.path.exists(iso_mount + '/boot/grub/footer.cfg'):
         logging.warning("Warning: Grml releases older than 2011.12 support only one flavour in grub.")
@@ -1151,10 +1152,13 @@ def identify_grml_flavour(mountpath):
             for line in tmpfile.readlines():
                 flavours.append(get_flavour(line))
         except TypeError, e:
-            raise
+            logging.critical("Unexpected TypeError: %s", e)
+            cleanup()
+            sys.exit(1)
         except Exception, e:
-            logging.critical("Unexpected error: %s", e)
-            raise
+            logging.critical("Unexpected Exception error: %s", e)
+            cleanup()
+            sys.exit(1)
         finally:
             if tmpfile:
                 tmpfile.close()
@@ -1502,13 +1506,15 @@ def install_grml(mountpoint, device):
             mount(device, device_mountpoint, ['-o', 'utf8,iocharset=iso8859-1'])
         except VerifyException, error:
             logging.critical("Fatal: %s", error)
-            raise
+            cleanup()
+            sys.exit(1)
         except CriticalException, error:
             try:
                 mount(device, device_mountpoint, "")
             except CriticalException, error:
                 logging.critical("Fatal: %s", error)
-                raise
+                cleanup()
+                sys.exit(1)
     try:
         grml_flavours = identify_grml_flavour(mountpoint)
         for flavour in set(grml_flavours):