Work around for label exception

adafruit/Adafruit_CircuitPython_Display_Text#45

Author: jimbobbennett

PyPortal_Azure_Plant_Monitor/azure_gfx_helper.py

@@ -36,6 +36,7 @@ def __init__(self, is_celsius=True):
         self._cwd = cwd
         self.set_icon(self._cwd+"/images/azure_splash.bmp")
 
+    def show_text(self):
         print('loading fonts...')
         glyphs = b'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-,.: '
         data_glyphs = b'012345678-,.:/FC'
@@ -56,7 +57,7 @@ def __init__(self, is_celsius=True):
         self.temp_label.y = 65
         self._text_group.append(self.temp_label)
 
-        self.temp_text = Label(self.data_font, max_glyphs=10)
+        self.temp_text = Label(self.data_font, max_glyphs=10, text="")
         self.temp_text.x = 200
         self.temp_text.y = 85
         self._text_group.append(self.temp_text)
@@ -66,12 +67,12 @@ def __init__(self, is_celsius=True):
         self.moisture_label.y = 135
         self._text_group.append(self.moisture_label)
 
-        self.moisture_text = Label(self.data_font, max_glyphs=10)
+        self.moisture_text = Label(self.data_font, max_glyphs=10, text="")
         self.moisture_text.x = 200
         self.moisture_text.y = 175
         self._text_group.append(self.moisture_text)
 
-        self.azure_status_text = Label(self.main_font, max_glyphs=15)
+        self.azure_status_text = Label(self.main_font, max_glyphs=15, text="")
         self.azure_status_text.x = 65
         self.azure_status_text.y = 225
         self._text_group.append(self.azure_status_text)