Table 'field_data_field_user_picture' not found in panopoly_users_update_7001() when updating from very old Panopoly

When updating from very old versions of Panopoly (1.0-beta4 in this case), panopoly_users_update_7001() will error out with:

SQLSTATE[42S02]: Base table or view not found: 1146 Table 'pantheon.field_data_field_user_picture' doesn't exist

This is because it's so old, the 'field_user_picture' field didn't exist in the past. In any case, if it didn't exist there is no point in that update function trying to migrate it's data. I'll attach a patch that simply skips that if the table doesn't exist.