org.el (org-fontify-meta-lines-and-blocks-1): Fix bug when fontifying keywords with no value

* org.el (org-fontify-meta-lines-and-blocks-1): Fix bug when
fontifying keywords with no value.

lisp/org.el

@@ -5422,9 +5422,9 @@ by a #."
 		 '(font-lock-fontified t invisible t)
 	       '(font-lock-fontified t face org-document-info-keyword)))
 	    (add-text-properties
-	     (match-beginning 6) (match-end 6)
+	     (match-beginning 6) (1+ (match-end 6))
 	     (if (string-equal dc1 "+title:")
-		 '(font-lock-fontified t face org-document-title)
+	    	 '(font-lock-fontified t face org-document-title)
 	       '(font-lock-fontified t face org-document-info))))
 	   ((or (equal dc1 "+results")
 		(member dc1 '("+begin:" "+end:" "+caption:" "+label:"