patch 8.2.2446: setting 'term' empty has different error if compiled with GUI

Problem:    Setting 'term' empty has different error if compiled with GUI.
Solution:   Insert "else". (closes #7766)

src/optionstr.c

@@ -687,7 +687,7 @@ did_set_string_option(
 	if (T_NAME[0] == NUL)
 	    errmsg = N_("E529: Cannot set 'term' to empty string");
 #ifdef FEAT_GUI
-	if (gui.in_use)
+	else if (gui.in_use)
 	    errmsg = N_("E530: Cannot change term in GUI");
 	else if (term_is_gui(T_NAME))
 	    errmsg = N_("E531: Use \":gui\" to start the GUI");

src/testdir/test_options.vim

@@ -484,12 +484,10 @@ func Test_set_ttytype()
   set ttytype=xterm
   call assert_equal('xterm', &ttytype)
   call assert_equal(&ttytype, &term)
-  " "set ttytype=" gives E522 instead of E529
-  " in travis on some builds. Why?  Catch both for now
   try
     set ttytype=
     call assert_report('set ttytype= did not fail')
-  catch /E529\|E522/
+  catch /E529/
   endtry
 
   " Some systems accept any terminal name and return dumb settings,

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2446,
 /**/
     2445,
 /**/