Chart file gets corrupted, if we save file in Libreoffice and open in MS office.
MS Office gives error, file is Corrupt.

Following charts get fixed

1. Radar chart
2. Area chart without data labels
3. Line chart
4. Bubble chart

Area chart with data label file gets courrputed after roundtrip in Libreoffice.

Change-Id: Ib03ad49aae268b53aa18bdc21c723e2a7777eb45