Always close the password dialog

The password dialog should be closed even if no password is provided.
Otherwise, it is not possible to continue, because the UI is blocked.

(cherry picked from commit b24fd67)

Resolves: rhbz#2125272

Author: poncovka

simpleline/render/adv_widgets.py

@@ -87,14 +87,13 @@ def prompt(self, args=None):
             return None
 
         self._password = handler.value
-        if not self._password:
-            return None
-        else:
-            # this may seem innocuous, but it's really a giant hack; we should
-            # not be calling close() from prompt(), but the input handling code
-            # in the TUI is such that without this very simple workaround, we
-            # would be forever pelting users with a prompt to enter their pw
-            self.close()
+
+        # this may seem innocuous, but it's really a giant hack; we should
+        # not be calling close() from prompt(), but the input handling code
+        # in the TUI is such that without this very simple workaround, we
+        # would be forever pelting users with a prompt to enter their pw
+        self.close()
+        return None
 
     @property
     def answer(self):