Remove error when count is invalid to :tab-pin

qutebrowser/browser/commands.py

@@ -277,7 +277,7 @@ class CommandDispatcher:
         """
         tab = self._cntwidget(count)
         if tab is None:
-            raise cmdexc.CommandError("Tab {} does not exist!".format(count))
+            return
 
         to_pin = not tab.data.pinned
         self._tabbed_browser.set_tab_pinned(tab, to_pin)

tests/end2end/features/tabs.feature

@@ -1078,8 +1078,7 @@ Feature: Tab management
         And I open data/numbers/2.txt in a new tab
         And I open data/numbers/3.txt in a new tab
         And I run :tab-pin with count 23
-        Then the error "Tab 23 does not exist!" should be shown
-        And the following tabs should be open:
+        Then the following tabs should be open:
             - data/numbers/1.txt
             - data/numbers/2.txt
             - data/numbers/3.txt (active)