[environments] Do not fail if the platform cannot be reached

This makes the behaviour consistant with the local discovery of
environments.

beat/cmdline/environments.py

@@ -50,8 +50,12 @@ logger = logging.getLogger(__name__)
 
 def get_remote_environments(ctx):
     config = ctx.meta.get("config")
-    with common.make_webapi(config) as webapi:
-        return webapi.get("/api/v1/backend/environments/")
+    try:
+        with common.make_webapi(config) as webapi:
+            return webapi.get("/api/v1/backend/environments/")
+    except Exception as e:
+        logger.error("Failed to connect to platform: {}".format(e))
+        return {}
 
 
 def get_docker_environments():