Fix bard field migration when field value is html string.

If a bard value was saved before the bard field had any configured bard sets in v2, an html string would be saved. This normalizes that string to a set payload before migrating it.

src/ContentMigrator.php

@@ -346,6 +346,13 @@ protected function migrateReplicatorSet($set, $fieldConfigs)
      */
     protected function migrateBardField($handle, $value, $config)
     {
+        // If content was saved while bard had no sets, value may be a string, so we'll normalize to a bard text set...
+        if (is_string($value)) {
+            $value = [
+                ['type' => 'text', 'text' => $value],
+            ];
+        }
+
         return $this->migrateReplicatorField($handle, $value, $config);
     }
 

tests/ContentMigratorTest.php

@@ -620,7 +620,9 @@ public function it_can_migrate_bards_with_no_sets()
             ]);
 
         $expected = [
-            'some_bard' => 'Well hello there!',
+            'some_bard' => [
+                ['type' => 'text', 'text' => 'Well hello there!'],
+            ],
             'blueprint' => 'speaker',
         ];