Make PhrictionContent "description" non-nullable

Summary:
Depends on D19095. Ref T6203. Ref T13077. This column is nullable in an inconsistent way. Make it non-nullable.

Also clean up one more content query on the history view.

Test Plan: Ran migration, then created and edited documents without providing a descriptino or hitting `NULL` exceptions.

Maniphest Tasks: T13077, T6203

Differential Revision: https://secure.phabricator.com/D19096

resources/sql/autopatches/20180215.phriction.03.descempty.sql

@@ -0,0 +1,2 @@
+UPDATE {$NAMESPACE}_phriction.phriction_content
+  SET description = '' WHERE description IS NULL;

resources/sql/autopatches/20180215.phriction.04.descnull.sql

@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_phriction.phriction_content
+  CHANGE description description LONGTEXT NOT NULL COLLATE {$COLLATE_TEXT};

src/applications/phriction/conduit/PhrictionCreateConduitAPIMethod.php

@@ -57,7 +57,7 @@ final class PhrictionCreateConduitAPIMethod extends PhrictionConduitAPIMethod {
       ->setActor($request->getUser())
       ->setContentSource($request->newContentSource())
       ->setContinueOnNoEffect(true)
-      ->setDescription($request->getValue('description'));
+      ->setDescription((string)$request->getValue('description'));
 
     try {
       $editor->applyTransactions($doc, $xactions);

src/applications/phriction/conduit/PhrictionEditConduitAPIMethod.php

@@ -52,7 +52,7 @@ final class PhrictionEditConduitAPIMethod extends PhrictionConduitAPIMethod {
       ->setActor($request->getUser())
       ->setContentSource($request->newContentSource())
       ->setContinueOnNoEffect(true)
-      ->setDescription($request->getValue('description'));
+      ->setDescription((string)$request->getValue('description'));
 
     try {
       $editor->applyTransactions($doc, $xactions);

src/applications/phriction/controller/PhrictionHistoryController.php

@@ -22,16 +22,13 @@ final class PhrictionHistoryController
 
     $current = $document->getContent();
 
-    $pager = new PHUIPagerView();
-    $pager->setOffset($request->getInt('page'));
-    $pager->setURI($request->getRequestURI(), 'page');
+    $pager = id(new AphrontCursorPagerView())
+      ->readFromRequest($request);
 
-    $history = id(new PhrictionContent())->loadAllWhere(
-      'documentID = %d ORDER BY version DESC LIMIT %d, %d',
-      $document->getID(),
-      $pager->getOffset(),
-      $pager->getPageSize() + 1);
-    $history = $pager->sliceResults($history);
+    $history = id(new PhrictionContentQuery())
+      ->setViewer($viewer)
+      ->withDocumentPHIDs(array($document->getPHID()))
+      ->executeWithCursorPager($pager);
 
     $author_phids = mpull($history, 'getAuthorPHID');
     $handles = $this->loadViewerHandles($author_phids);

src/applications/phriction/editor/PhrictionTransactionEditor.php

@@ -596,10 +596,13 @@ final class PhrictionTransactionEditor
       ->setAuthorPHID($this->getActor()->getPHID())
       ->setChangeType(PhrictionChangeType::CHANGE_EDIT)
       ->setTitle($this->getOldContent()->getTitle())
-      ->setContent($this->getOldContent()->getContent());
+      ->setContent($this->getOldContent()->getContent())
+      ->setDescription('');
+
     if (strlen($this->getDescription())) {
       $new_content->setDescription($this->getDescription());
     }
+
     $new_content->setVersion($this->getOldContent()->getVersion() + 1);
 
     return $new_content;

src/applications/phriction/storage/PhrictionContent.php

@@ -30,10 +30,7 @@ final class PhrictionContent
         'content' => 'text',
         'changeType' => 'uint32',
         'changeRef' => 'uint32?',
-
-        // T6203/NULLABILITY
-        // This should just be empty if not provided?
-        'description' => 'text?',
+        'description' => 'text',
       ),
       self::CONFIG_KEY_SCHEMA => array(
         'documentID' => array(