Invitation shown as "Unknown" when sent from EAS account and received sending failure server email and tried to open it from .eml attachment.
[Problem] Invitation shown as "Unknown" when sent from EAS account and received sending failure server email and tried to open it from .eml attachment.
[Cause & Measure] Cause: In parsing mime, "unknwon" is set as its name before checking content subtype as "calendar".
Measure: Checking content subtype first if it is calendar then set its name as "unknown" if it is not calendar type.
Change-Id: I2ba5ee8368d397b152d395db1e073e9d290c672d