Allow to not configure default parameters

grafana/files/grafana.ini

@@ -20,7 +20,11 @@ logs = {{ server.path.logs }}
 #################################### Server ####################################
 [server]
 # Protocol (http or https)
+{%- if 'protocol' in server %}
 protocol = {{ server.protocol }}
+{%- else %}
+;protocol = http
+{% endif %}
 
 # The ip address to bind to, empty will bind to all interfaces
 http_addr = {{ server.bind.address }}
@@ -29,14 +33,22 @@ http_addr = {{ server.bind.address }}
 http_port = {{ server.bind.port }}
 
 # The public facing domain name used to access grafana from a browser
+{%- if 'domain' in server %}
 domain = {{ server.domain }}
+{%- else %}
+;domain = localhost
+{%- endif %}
 
 # Redirect to correct domain if host header does not match domain
 # Prevents DNS rebinding attacks
 ;enforce_domain = false
 
 # The full public facing url
+{%- if 'root_url' in server %}
 root_url = {{ server.root_url }}
+{%- else %}
+;root_url = %(protocol)s://%(domain)s:%(http_port)s/
+{%- endif %}
 
 # Log web requests
 ;router_logging = false