Fix the null check when converting to PSRoledefinition (Azure#24759)

* Fix the null check when converting to PSRoledefinition

* Update src/Resources/Resources/Models.Authorization/AuthorizationClientExtensions.cs

Co-authored-by: Beisi Zhou <[email protected]>

* address review comment

---------

Co-authored-by: Beisi Zhou <[email protected]>

Author: veseshad92

src/Resources/Resources/ChangeLog.md

@@ -19,6 +19,7 @@
 -->
 
 ## Upcoming Release
+* Added null check to the permissions object in the ToPSRoleDefinition method to return if the whole permissions object array is null.
 
 ## Version 6.16.2
 * Introduced secrets detection feature to safeguard sensitive data.

src/Resources/Resources/Models.Authorization/AuthorizationClientExtensions.cs

@@ -58,8 +58,8 @@ public static PSRoleDefinition ToPSRoleDefinition(this RoleDefinition role)
                     AssignableScopes = role.AssignableScopes.ToList(),
                     Description = role.Description,
                     IsCustom = role.RoleType == CustomRole ? true : false,
-                    Condition = role.Permissions[0]?.Condition,
-                    ConditionVersion = role.Permissions[0]?.ConditionVersion
+                    Condition = role?.Permissions?[0]?.Condition,
+                    ConditionVersion = role?.Permissions?[0]?.ConditionVersion
                 };
             }