patch 8.2.3341: Vim9: function call aborted despite try/catch

Problem:    Vim9: function call aborted despite try/catch. (Naohiro Ono)
Solution:   Ignore error caught by try/catch. (closes #8755)
diff --git a/src/evalvars.c b/src/evalvars.c
index 721b688..86a6694 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -1193,7 +1193,8 @@
 	    if (!VIM_ISWHITE(*arg) && !ends_excmd(*arg))
 	    {
 		emsg_severe = TRUE;
-		semsg(_(e_trailing_arg), arg);
+		if (!error)
+		    semsg(_(e_trailing_arg), arg);
 		break;
 	    }
 	}