Fix codefresh_account refresh for on-prem installations (#109)

## What

* Fix `codefresh_account` refresh for on-prem installations

## Why

* On-prem API does not return 'limits' field

## Notes
<!-- Add any notes here -->

## Checklist

* [x] _I have read
[CONTRIBUTING.md](https://github.com/codefresh-io/terraform-provider-codefresh/blob/master/README.md)._
* [x] _I have [allowed changes to my fork to be
made](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/allowing-changes-to-a-pull-request-branch-created-from-a-fork)._
* [x] _I have added tests, assuming new tests are warranted_.
* [x] _I understand that the `/test` comment will be ignored by the CI
trigger [unless it is made by a repo admin or
collaborator](https://codefresh.io/docs/docs/pipelines/triggers/git-triggers/#support-for-building-pull-requests-from-forks)._

Co-authored-by: Yonatan Koren <10080107+korenyoni@users.noreply.github.com>

Author: korenyoni

client/account.go

@@ -128,10 +128,6 @@ type Account struct {
 	RepoPermission              string              `json:"repoPermission,omitempty"`
 	Limits                      *Limits             `json:"limits,omitempty"`
 	Features                    map[string]bool     `json:"features,omitempty"`
-	// Features                    *Features           `json:"features,omitempty"`
-	// RuntimeEnvironments ToDo
-	// Remaining ToDo
-	// ID string `json:"id"`
 }
 
 type AccountDetails struct {

codefresh/resource_account.go

@@ -155,24 +155,21 @@ func resourceAccountDelete(d *schema.ResourceData, meta interface{}) error {
 }
 
 func mapAccountToResource(account *cfClient.Account, d *schema.ResourceData) error {
-
 	err := d.Set("name", account.Name)
 	if err != nil {
 		return err
 	}
 
-	// err = d.Set("admins", account.Admins)
-	// if err != nil {
-	// 	return err
-	// }
 	err = d.Set("features", account.Features)
 	if err != nil {
 		return err
 	}
 
-	err = d.Set("limits", []map[string]interface{}{flattenLimits(*account.Limits)})
-	if err != nil {
-		return err
+	if account.Limits != nil { // On-prem API does not return 'limits' field
+		err = d.Set("limits", []map[string]interface{}{flattenLimits(*account.Limits)})
+		if err != nil {
+			return err
+		}
 	}
 
 	err = d.Set("build", []map[string]interface{}{flattenBuild(*account.Build)})
@@ -197,12 +194,9 @@ func flattenBuild(build cfClient.Build) map[string]interface{} {
 	return res
 }
 func mapResourceToAccount(d *schema.ResourceData) *cfClient.Account {
-	// admins := d.Get("admins").(*schema.Set).List()
-
 	account := &cfClient.Account{
 		ID:   d.Id(),
 		Name: d.Get("name").(string),
-		// Admins: convertStringArr(admins),
 	}
 
 	if _, ok := d.GetOk("features"); ok {