Fix: Don't show blank lines for disabled headers

i.e. with ":name none" and org-super-agenda-header-separator set to an
empty string.

Fixes alphapapa#105. Thanks to Florian Schrödl (@floscr).

README.org

@@ -233,6 +233,7 @@ These selectors take one argument alone, or multiple arguments in a list.
 *Fixed*
 +  =:children todo= group selection ([[/~https://github.com/alphapapa/org-super-agenda/issues/75][#75]]).  (Thanks to [[/~https://github.com/bleggett][Ben Leggett]] and [[/~https://github.com/whirm][Elric Milon]].)
 +  =:children= group headings.
++  Don't show blank lines for disabled headers (i.e. with ~:name none~ and =org-super-agenda-header-separator= set to an empty string).  (Fixes [[/~https://github.com/alphapapa/org-super-agenda/issues/105][#105]].  Thanks to [[/~https://github.com/floscr][Florian Schrödl]].)
 
 *Updated*
 +  Tests updated for Org 9.2.4.

org-super-agenda.el

@@ -1093,10 +1093,11 @@ actually the ORDER for the groups."
 
 (defun org-super-agenda--filter-finalize-entries (string)
   "Filter the return of `org-agenda-finalize-entries' through `org-super-agenda--finalize-entries'."
-  (mapconcat 'identity
-             (org-super-agenda--group-items
-              (split-string string "\n" t))
-             "\n"))
+  (--> string
+       (split-string it "\n" 'omit-nulls)
+       org-super-agenda--group-items
+       (-remove #'s-blank-str? it)
+       (s-join "\n" it)))
 
 ;;;; Footer
 

org-super-agenda.info

@@ -526,6 +526,11 @@ File: README.info,  Node: 12-pre,  Next: 111,  Up: Changelog
      (Thanks to Ben Leggett (/~https://github.com/bleggett) and Elric
      Milon (/~https://github.com/whirm).)
    • :children group headings.
+   • Don’t show blank lines for disabled headers (i.e.  with ‘:name
+     none’ and org-super-agenda-header-separator set to an empty
+     string).  (Fixes #105
+     (/~https://github.com/alphapapa/org-super-agenda/issues/105).  Thanks
+     to Florian Schrödl (/~https://github.com/floscr).)
 
    *Updated*
    • Tests updated for Org 9.2.4.
@@ -689,16 +694,16 @@ Node: Normal selectors12756
 Node: Tips17387
 Node: Changelog18238
 Node: 12-pre18463
-Node: 11119723
-Node: 1119896
-Node: 10321468
-Node: 10221679
-Node: 10121813
-Node: 10022151
-Node: Development22256
-Node: Bugs22658
-Node: Tests23311
-Node: Credits23630
+Node: 11120019
+Node: 1120192
+Node: 10321764
+Node: 10221975
+Node: 10122109
+Node: 10022447
+Node: Development22552
+Node: Bugs22954
+Node: Tests23607
+Node: Credits23926
 
 End Tag Table
 

test/results.el

@@ -1629,8 +1629,6 @@ Wednesday   5 July 2017
   ambition:   TODO Practice leaping tall                     !                                           :universe:ambition::personal:
 " "1ddbb96d38fccc4a44677f0a2240ebe2" "Day-agenda (W27):
 Wednesday   5 July 2017
-
- 
   test:        7:02...... Sunrise (12:04 of daylight)
                8:00...... ----------------
               10:00...... ----------------