Merge pull request adafruit#32 from kattni/fix-display-on-none

Fixes issue where label will not display when value is False

Author: kattni

adafruit_display_text/label.py

@@ -79,7 +79,7 @@ def __init__(self, font, *, text=None, max_glyphs=None, color=0xffffff,
         self._line_spacing = line_spacing
         self._boundingbox = None
 
-        if text:
+        if text is not None:
             self._update_text(str(text))