Added env var checking

config.py

 from os import environ
+from sys import exit
+import logging
+
+
+LOGGER = logging.getLogger(__name__)
 
 
 SERVER = environ.get("BITS_SERVER")
 PORT = int(environ.get("BITS_PORT", default=1883))
 USERNAME = environ.get("BITS_USER")
-PASSWORD = environ.get("BITS_PASSWORD", default="")
-TG_KEY = environ.get("BITS_TG_KEY", default="")
+PASSWORD = environ.get("BITS_PASSWORD")
+TG_KEY = environ.get("BITS_TG_KEY")
 ADMIN_CHANNELS_FULL = []  # Channels that are allowed to change HQ's status
 ADMIN_CHANNELS_PRIV = []  # Channels that are allowed to change HQ's status
 
 DEBUG = environ.get("DEBUG", default=None)
 
 for chan in environ.get("BITS_TG_GROUPS_FULL", default="").split(":"):
+    if chan == "":
+        continue
     ADMIN_CHANNELS_FULL.append(chan)
 for chan in environ.get("BITS_TG_GROUPS_PRIV", default="").split(":"):
+    if chan == "":
+        continue
     ADMIN_CHANNELS_PRIV.append(chan)
+
+
+if SERVER is None:
+    LOGGER.critical("An IP for the mqtt broker must be specified")
+    exit()
+
+if USERNAME is None or PASSWORD is None:
+    LOGGER.critical("Credentials for both username and password are unspecified")
+    exit()
+
+if TG_KEY is None:
+    LOGGER.critical("The token for the telegrambot is unspecified")
+    exit()
+
+if len(ADMIN_CHANNELS_PRIV) == 0 and len(ADMIN_CHANNELS_FULL) == 0:
+    LOGGER.critical("Atleast 1 admin channel must be given")
+    exit()