MDL-58535 repository_onedrive: Better error

When OneDrive has never been initialised the Graph API returns an error. Detect this and
direct the user to log in to OneDrive.

repository/onedrive/lang/en/repository_onedrive.php

@@ -34,6 +34,7 @@ $string['importskydrivefiles'] = 'Import files from Microsoft SkyDrive repositor
 $string['internal'] = 'Internal (files stored in Moodle)';
 $string['issuer_help'] = 'Select the OAuth 2 service that is configured to talk to the OneDrive API. If the services does not exist yet, you might need to create it.';
 $string['issuer'] = 'OAuth 2 service';
+$string['mysitenotfound'] = 'You have never logged into OneDrive before. You must login to OneDrive at least once it before it can be used with Moodle.';
 $string['oauth2serviceslink'] = '<a href="{$a}" title="Link to OAuth Services configuration">OAuth 2 Services Configuration</a>';
 $string['owner'] = 'Owned by: {$a}';
 $string['pluginname'] = 'Microsoft OneDrive';

repository/onedrive/lib.php

@@ -311,8 +311,8 @@ class repository_onedrive extends repository {
         } catch (Exception $e) {
             if ($e->getCode() == 403 && strpos($e->getMessage(), 'Access Not Configured') !== false) {
                 throw new repository_exception('servicenotenabled', 'repository_onedrive');
-            } else {
-                throw $e;
+            } else if (strpos($e->getMessage(), 'mysite not found') !== false) {
+                throw new repository_exception('mysitenotfound', 'repository_onedrive');
             }
         }