Prevent the "funcinfo" command from printing errors

Add a try{} scope around the exec statement that raises errors when no
selection was possible/made.

rc/ctags.kak

@@ -36,6 +36,7 @@ def tag-complete -docstring "Insert completion candidates for the current select
 
 def ctags-funcinfo -docstring "Display ctags information about a selected function" %{
     eval -draft %{
+        try %{
             exec '[(;B<a-k>[a-zA-Z_]+\(<ret><a-;>'
             %sh{
                 sigs=$(readtags -e ${kak_selection%(} | grep kind:f | sed -re 's/^(\S+).*((class|struct|namespace):(\S+))?.*signature:(.*)$/\5 [\4::\1]/')
@@ -45,6 +46,7 @@ def ctags-funcinfo -docstring "Display ctags information about a selected functi
             }
         }
     }
+}
 
 def ctags-enable-autoinfo -docstring "Automatically display ctags information about function" %{
      hook window -group ctags-autoinfo NormalKey .* ctags-funcinfo