notmuch-emacs-mua: set EMACS{,CLIENT} variables to defaults when empty

... in addition to doing this when these variables are unset.

It is more useful to use defaults (emacs or emacsclient) than empty
string as a command name.

diff --git a/notmuch-emacs-mua b/notmuch-emacs-mua
index 016fa12613c49c217b11fa8959c55a1e50a8e40f..4404cd7c33b870c9fa6c1a26c24143852b6e9c25 100755 (executable)
--- a/notmuch-emacs-mua
+++ b/notmuch-emacs-mua
@@ -30,8 +30,8 @@ escape ()
     printf -v $2 '%s' "${__escape_arg__//\"/\\\"}"
 }
 
-EMACS=${EMACS-emacs}
-EMACSCLIENT=${EMACSCLIENT-emacsclient}
+EMACS=${EMACS:-emacs}
+EMACSCLIENT=${EMACSCLIENT:-emacsclient}
 
 PRINT_ONLY=
 NO_WINDOW=