[image_picker] fix error if pick image from yandex disk(dropbox) (#1265)

Certain cloud storage platform does not have data column. We return null when there is no data column and fetch the image from online source. 
fixed flutter/flutter#26940
fixed flutter/flutter#21547

Author: ivk1800

packages/image_picker/CHANGELOG.md

@@ -1,3 +1,6 @@
+## 0.5.0+7
+* Fix a crash when selecting images from yandex.disk and dropbox.
+
 ## 0.5.0+6
 
 * Delete the original image if it was scaled.

packages/image_picker/android/src/main/java/io/flutter/plugins/imagepicker/FileUtils.java

@@ -116,7 +116,13 @@ private static String getDataColumn(
     try {
       cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
       if (cursor != null && cursor.moveToFirst()) {
-        final int column_index = cursor.getColumnIndexOrThrow(column);
+        final int column_index = cursor.getColumnIndex(column);
+
+        //yandex.disk and dropbox do not have _data column
+        if (column_index == -1) {
+          return null;
+        }
+
         return cursor.getString(column_index);
       }
     } finally {

packages/image_picker/pubspec.yaml

@@ -5,7 +5,7 @@ authors:
   - Flutter Team <[email protected]>
   - Rhodes Davis Jr. <[email protected]>
 homepage: https://github.com/flutter/plugins/tree/master/packages/image_picker
-version: 0.5.0+6
+version: 0.5.0+7
 
 flutter:
   plugin: