api call error forwarding to cli

* prints api call error along with http error
* checks for empty error response body

Closes-bug: #1259585

Change-Id: I332fa960d74681610e6cf6b759c9b6bd5f91ec91

fuelclient/fuel

@@ -78,7 +78,13 @@ class SetAction(argparse.Action):
 
 def handle_exceptions(exc):
     if isinstance(exc, urllib2.HTTPError):
-        print_error(str(exc))
+        error_body = exc.read()
+        print_error("{0} {1}".format(
+            exc,
+            "({0})".format(
+                "" if error_body is None else error_body
+            )
+        ))
     elif isinstance(exc, urllib2.URLError):
         print_error("Can't connect to Nailgun server!")
     else:
@@ -488,6 +494,11 @@ def node(params):
         if not params.node and params.env:
             node_ids = [k for k, v in nodes_clusters.iteritems()
                         if v == int(params.env)]
+            if not node_ids:
+                print_error(
+                    "Environment with id={0} doesn't have nodes to remove."
+                    .format(params.env)
+                )
         else:
             node_ids = list(chain(*params.node))
         data = map(