Merge pull request #34 from colonwq/add_sdcheck

Add sd_check function to pyportal

Author: kattni

adafruit_pyportal.py

@@ -719,6 +719,13 @@ def image_converter_url(image_url, width, height, color_depth=16):
         return IMAGE_CONVERTER_SERVICE % (aio_username, aio_key,
                                           width, height,
                                           color_depth, image_url)
+    def sd_check(self):
+        """Returns True if there is an SD card preset and False
+        if there is no SD card. The _sdcard value is set in _init
+        """
+        if self._sdcard:
+            return True
+        return False
 
     def push_to_io(self, feed_key, data):
         # pylint: disable=line-too-long