patch 8.2.0407: no early check if :find and :sfind have an argument

Problem:    No early check if :find and :sfind have an argument.
Solution:   Add EX_NEEDARG.
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index f09fb3b..2e35c8d 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -584,7 +584,7 @@
 	EX_BANG|EX_NEEDARG|EX_EXTRA|EX_NOTRLCOM,
 	ADDR_NONE),
 EXCMD(CMD_find,		"find",		ex_find,
-	EX_RANGE|EX_BANG|EX_FILE1|EX_CMDARG|EX_ARGOPT|EX_TRLBAR,
+	EX_RANGE|EX_BANG|EX_FILE1|EX_CMDARG|EX_ARGOPT|EX_TRLBAR|EX_NEEDARG,
 	ADDR_OTHER),
 EXCMD(CMD_finally,	"finally",	ex_finally,
 	EX_TRLBAR|EX_SBOXOK|EX_CMDWIN,
@@ -1334,7 +1334,7 @@
 	EX_BANG|EX_TRLBAR|EX_EXTRA|EX_CMDWIN|EX_SBOXOK,
 	ADDR_NONE),
 EXCMD(CMD_sfind,	"sfind",	ex_splitview,
-	EX_BANG|EX_FILE1|EX_RANGE|EX_CMDARG|EX_ARGOPT|EX_TRLBAR,
+	EX_BANG|EX_FILE1|EX_RANGE|EX_CMDARG|EX_ARGOPT|EX_TRLBAR|EX_NEEDARG,
 	ADDR_OTHER),
 EXCMD(CMD_sfirst,	"sfirst",	ex_rewind,
 	EX_EXTRA|EX_BANG|EX_CMDARG|EX_ARGOPT|EX_TRLBAR,