v3.1.0

Added

• pyppms.common.fmt_time() to string-format a datetime object that might also be None (in which case a fixed string is returned).
• pyppms.booking.PpmsBooking.desc has been added as a property to retrieve a shorter description of the object than calling str() on it.
• pyppms.exceptions.NoDataError has been added to indicate a PUMAPI response did not contain any useful data.
• pyppms.common.parse_multiline_response() will now raise the newly added NoDataError in case the requested runningsheet for a day doesn't contain any bookings to allow for properly dealing with "empty" days.

Changed

• Several log messages have been demoted from debug to trace level and might have been shortened / combined to reduce logging clutter.