Handle case in LMU creation when there are no managers available

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="pp_ifdef('chromeos')">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 417 matching lines @@
   </message>
   <message name="IDS_CREATE_ACCOUNT_HTML" desc="Text shown on side of Google sign-in UI.">
     If you don't have a Google Account you can <ph name="LINK_START">$1<ex>&gt;a&lt;</ex></ph>create a Google Account<ph name="LINK_END">$2<ex>&gt;/a&lt;</ex></ph> now.
   </message>
   <message name="IDS_BROWSE_WITHOUT_SIGNING_IN_HTML" desc="Text shown on side of Google sign-in UI.">
     You may also skip signing in and <ph name="LINK_START">$1<ex>&gt;a&lt;</ex></ph>browse as Guest<ph name="LINK_END">$2<ex>&gt;/a&lt;</ex></ph>.
   </message>
   <message name="IDS_CREATE_LOCALLY_MANAGED_USER_FEATURE_NAME" desc="Title close to icon shown on side of Google sign-in UI to create a locally managed user.">
     Locally managed user
   </message>
+  <message name="IDS_CREATE_LOCALLY_MANAGED_USER_NO_MANAGER_TEXT" desc="Text shown when managed user can be created, but no users that can be manager exist.">
+    At least one account must exist on this device before creating a Limited user.
+  </message>
   <message name="IDS_CREATE_LOCALLY_MANAGED_USER_HTML" desc="Text with actual name shown on side of Google sign-in UI to create a locally managed user.">
     <ph name="LINK_START">$1<ex>&gt;a&lt;</ex></ph>Create managed user<ph name="LINK_END">$2<ex>&gt;/a&lt;</ex></ph> for this device.
   </message>
   <message name="IDS_CREATE_LOCALLY_MANAGED_USER_CREATE_ACCOUNT_NAME_TITLE" desc="Text shown as a title for user name field in locally managed user creation dialog.">
     Create an account name
   </message>
   <message name="IDS_CREATE_LOCALLY_MANAGED_USER_CREATE_PASSWORD_TITLE" desc="Text shown as a title for password fields in locally managed user creation dialog.">
     Create a password for this account
   </message>
   <message name="IDS_CREATE_LOCALLY_MANAGED_USER_CREATE_PASSWORD_HINT" desc="Text shown as a hint in the password field in locally managed user creation dialog.">
@@ skipping 3185 matching lines @@
   <message name="IDS_KIOSK_APP_ERROR_UNABLE_TO_MOUNT" desc="Error message used when a kiosk app fails to launch due to cryptohome error.">
     Kryptonite! The cryptohome for the kiosk application could not be mounted.
   </message>
   <message name="IDS_KIOSK_APP_ERROR_UNABLE_TO_INSTALL" desc="Error message used when a kiosk app fails to launch due to install failure.">
     Kiosk application could not be installed.
   </message>
   <message name="IDS_KIOSK_APP_ERROR_USER_CANCEL" desc="Error message used when a kiosk app launch is canceled by user.">
     Kiosk application launch canceled.
   </message>
 </grit-part>