[management] return empty array instead of null on networks endpoints (#3480)

README.md

@@ -12,7 +12,7 @@
        <img src="https://img.shields.io/badge/license-BSD--3-blue" />
      </a> 
     <br>
-    <a href="https://join.slack.com/t/netbirdio/shared_invite/zt-2utg2ncdz-W7LEB6toRBLE1Jca37dYpg">
+    <a href="https://join.slack.com/t/netbirdio/shared_invite/zt-31rofwmxc-27akKd0Le0vyRpBcwXkP0g">
         <img src="https://img.shields.io/badge/slack-@netbird-red.svg?logo=slack"/>
      </a>  
      <br>
@@ -29,7 +29,7 @@
   <br/>
   See <a href="https://netbird.io/docs/">Documentation</a>
   <br/>
-   Join our <a href="https://join.slack.com/t/netbirdio/shared_invite/zt-2utg2ncdz-W7LEB6toRBLE1Jca37dYpg">Slack channel</a>
+   Join our <a href="https://join.slack.com/t/netbirdio/shared_invite/zt-31rofwmxc-27akKd0Le0vyRpBcwXkP0g">Slack channel</a>
   <br/>
  
 </strong>

management/server/http/handlers/networks/handler.go

@@ -289,7 +289,7 @@ func (h *handler) collectIDsInNetwork(ctx context.Context, accountID, userID, ne
 }
 
 func (h *handler) generateNetworkResponse(networks []*types.Network, routers map[string][]*routerTypes.NetworkRouter, resourceIDs map[string][]string, groups map[string]*nbtypes.Group, account *nbtypes.Account) []*api.Network {
-	var networkResponse []*api.Network
+	networkResponse := make([]*api.Network, 0, len(networks))
 	for _, network := range networks {
 		routerIDs, peerCounter := getRouterIDs(network, routers, groups)
 		policyIDs := account.GetPoliciesAppliedInNetwork(network.ID)

management/server/http/handlers/networks/resources_handler.go

@@ -89,7 +89,7 @@ func (h *resourceHandler) getAllResourcesInAccount(w http.ResponseWriter, r *htt
 
 	grpsInfoMap := groups.ToGroupsInfoMap(grps, 0)
 
-	var resourcesResponse []*api.NetworkResource
+	resourcesResponse := make([]*api.NetworkResource, 0, len(resources))
 	for _, resource := range resources {
 		resourcesResponse = append(resourcesResponse, resource.ToAPIResponse(grpsInfoMap[resource.ID]))
 	}

management/server/http/handlers/networks/routers_handler.go

@@ -48,7 +48,7 @@ func (h *routersHandler) getAllRouters(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	var routersResponse []*api.NetworkRouter
+	routersResponse := make([]*api.NetworkRouter, 0, len(routers))
 	for _, router := range routers {
 		routersResponse = append(routersResponse, router.ToAPIResponse())
 	}