createnetworkform: Displaying api errors (#885)

createnetworkform: Displaying 'technical' API error message caused by backend configuration errors.
diff --git a/src/views/network/CreateIsolatedNetworkForm.vue b/src/views/network/CreateIsolatedNetworkForm.vue
index b4bcdd8..b40c241 100644
--- a/src/views/network/CreateIsolatedNetworkForm.vue
+++ b/src/views/network/CreateIsolatedNetworkForm.vue
@@ -415,6 +415,8 @@
       this.selectedNetworkOffering = {}
       api('listNetworkOfferings', params).then(json => {
         this.networkOfferings = json.listnetworkofferingsresponse.networkoffering
+      }).catch(error => {
+        this.$notifyError(error)
       }).finally(() => {
         this.networkOfferingLoading = false
         if (this.arrayHasItems(this.networkOfferings)) {
diff --git a/src/views/network/CreateL2NetworkForm.vue b/src/views/network/CreateL2NetworkForm.vue
index fc611b8..b21bce0 100644
--- a/src/views/network/CreateL2NetworkForm.vue
+++ b/src/views/network/CreateL2NetworkForm.vue
@@ -387,6 +387,8 @@
       }
       api('listNetworkOfferings', params).then(json => {
         this.networkOfferings = json.listnetworkofferingsresponse.networkoffering
+      }).catch(error => {
+        this.$notifyError(error)
       }).finally(() => {
         this.networkOfferingLoading = false
         if (this.arrayHasItems(this.networkOfferings)) {
diff --git a/src/views/network/CreateSharedNetworkForm.vue b/src/views/network/CreateSharedNetworkForm.vue
index 03cf301..e91a563 100644
--- a/src/views/network/CreateSharedNetworkForm.vue
+++ b/src/views/network/CreateSharedNetworkForm.vue
@@ -654,6 +654,8 @@
       this.networkOfferings = []
       api('listNetworkOfferings', params).then(json => {
         this.networkOfferings = json.listnetworkofferingsresponse.networkoffering
+      }).catch(error => {
+        this.$notifyError(error)
       }).finally(() => {
         this.networkOfferingLoading = false
         if (this.arrayHasItems(this.networkOfferings)) {