add a try block

Because of different password policies it makes sense to pack this
function in a try block to let the user know if he's using
a password which doesn't work

scripts/users/reset-password.ps1

@@ -11,6 +11,8 @@ Catch
 
 function Reset-Password
 {
+    Try
+    {
         $username = Read-Host 'Please enter a user name'
         $default_password = 'default-password'
         Unlock-ADAccount -Identity $username
@@ -23,6 +25,13 @@ function Reset-Password
           -backgroundcolor green
         Write-Host
         Read-Host 'Press a key to continue'
+    }
+    Catch
+    {
+        Write-Warning $_
+        Read-Host 'Press a key to continue'
+        Break
+    }
 }
 
 Reset-Password