Don't write anything if empty string

This avoids a bug where an app writes nothing, setting _first_output
to false, and then write something, and not getting enough space for
that, because the flag's already false.

1 files changed, 2 insertions, 0 deletions

diff --git a/ttystatus/messager.py b/ttystatus/messager.py
index d5dce46..f4cd143 100644
--- a/ttystatus/messager.py
+++ b/ttystatus/messager.py
@@ -99,6 +99,8 @@ class Messager(object):
 
     def write(self, string):
         '''Write raw data, always.'''
+        if not string:
+            return
         self.update_width()
         rows = string.split('\n')