Add try-catch blocks

access_node/__main__.py

@@ -14,8 +14,11 @@ import psycopg2
 
 def ConnectToDatabase(postgres_username, postgres_password):
     database_host = 'database'
+    try:
         with open('database_host.txt') as database_host_file:
             database_host = database_host_file.readline().rstrip('\n')
+    except:
+        pass
     return psycopg2.connect(database="postgres", user="postgres",
                        password="postgres", host=database_host, port="5432")
 

access_node/controllers/arbor_controller.py

@@ -16,8 +16,11 @@ import numpy as np
 
 def connect_to_database():
     database_host = 'database'
+    try:
         with open('database_host.txt') as database_host_file:
             database_host = database_host_file.readline().rstrip('\n')
+    except:
+        pass
     return psycopg2.connect(database="postgres", user="postgres",
                        password="postgres", host=database_host, port="5432")
 

access_node/controllers/nest_controller.py

@@ -16,8 +16,11 @@ import numpy as np
 
 def connect_to_database():
     database_host = 'database'
+    try:
         with open('database_host.txt') as database_host_file:
             database_host = database_host_file.readline().rstrip('\n')
+    except:
+        pass
     return psycopg2.connect(database="postgres", user="postgres",
                        password="postgres", host=database_host, port="5432")