status: remove the empty line after hints

Before this patch, there is inconsistency between the status
messages with hints and the ones without hints: there is an
empty line between the title and the file list if hints are
presented, but there isn't one if there are no hints.

This patch remove the inconsistency by removing the empty
lines even if hints are presented.

Signed-off-by: John Lin <[email protected]>

Author: johnlinp

t/t7060-wtstatus.sh

@@ -38,7 +38,6 @@ You have unmerged paths.
 
 Unmerged paths:
   (use "git add/rm <file>..." as appropriate to mark resolution)
-
 	deleted by us:   foo
 
 no changes added to commit (use "git add" and/or "git commit -a")
@@ -143,7 +142,6 @@ You have unmerged paths.
 
 Unmerged paths:
   (use "git add/rm <file>..." as appropriate to mark resolution)
-
 	both added:      conflict.txt
 	deleted by them: main.txt
 
@@ -177,7 +175,6 @@ You have unmerged paths.
 
 Unmerged paths:
   (use "git add/rm <file>..." as appropriate to mark resolution)
-
 	both deleted:    main.txt
 	added by them:   sub_master.txt
 	added by us:     sub_second.txt
@@ -201,12 +198,10 @@ You have unmerged paths.
   (use "git merge --abort" to abort the merge)
 
 Changes to be committed:
-
 	new file:   sub_master.txt
 
 Unmerged paths:
   (use "git rm <file>..." to mark resolution)
-
 	both deleted:    main.txt
 
 Untracked files not listed (use -u option to show untracked files)