Test that ending a reminder with %_ does add a blank line.

docs/WHATSNEW

@@ -21,6 +21,9 @@ CHANGES TO REMIND
 
 - NEW FEATURE: remind: Add trigtags() function per suggestion from Tim Chase.
 
+- NEW FEATURE: remind: The $AddBlankLines system variable controls whether or
+  not a blank line is added after each reminder.
+
 - BUG FIX: remind: Make MSF correctly format UTF-8 text and text with
   embedded ANSI color-changing codes.
 

tests/blanks.rem

@@ -1,4 +1,4 @@
-MSG $AddBlankLines=[$AddBlankLines]
+MSG $AddBlankLines=[$AddBlankLines]%_
 MSG Hello
 MSG Hi
 MSF How are you?

tests/test.cmp

@@ -6624,6 +6624,7 @@ Reminders for Saturday, 1st January, 2022:
 
 $AddBlankLines=1
 
+
 Hello
 
 Hi
@@ -6636,6 +6637,7 @@ Reminders for Saturday, 1st January, 2022:
 
 $AddBlankLines=1
 
+
 Hello
 
 Hi
@@ -6646,6 +6648,7 @@ OK
 
 Reminders for Saturday, 1st January, 2022:
 $AddBlankLines=0
+
 Hello
 Hi
 How are you?