Make sure that the options row was fetched successfully

lib/Doctrine/DBAL/Schema/DB2SchemaManager.php

@@ -222,7 +222,10 @@ class DB2SchemaManager extends AbstractSchemaManager
         $sql      = $platform->getListTableCommentsSQL($tableName);
 
         $tableOptions = $this->_conn->fetchAssoc($sql);
-        $table->addOption('comment', $tableOptions['REMARKS']);
+
+        if ($tableOptions !== false) {
+            $table->addOption('comment', $tableOptions['REMARKS']);
+        }
 
         return $table;
     }

lib/Doctrine/DBAL/Schema/OracleSchemaManager.php

@@ -399,7 +399,10 @@ SQL;
         $sql      = $platform->getListTableCommentsSQL($tableName);
 
         $tableOptions = $this->_conn->fetchAssoc($sql);
-        $table->addOption('comment', $tableOptions['COMMENTS']);
+
+        if ($tableOptions !== false) {
+            $table->addOption('comment', $tableOptions['COMMENTS']);
+        }
 
         return $table;
     }

lib/Doctrine/DBAL/Schema/PostgreSqlSchemaManager.php

@@ -500,7 +500,9 @@ class PostgreSqlSchemaManager extends AbstractSchemaManager
 
         $tableOptions = $this->_conn->fetchAssoc($sql);
 
-        $table->addOption('comment', $tableOptions['table_comment']);
+        if ($tableOptions !== false) {
+            $table->addOption('comment', $tableOptions['table_comment']);
+        }
 
         return $table;
     }