two dimensional filter gadget: when using a label field as the y-axis, all statistics for the different available entries in the label fields are listed. However, the issues that have an empty label field are not listed. This lets the statistics look inconsistant, since the Total-line summarieses all issues that pass the actual filter (especially in cases with a lot of empty label fields). With other field-types (custom and built in) a "None"-entry is added, if any issue does not contain a value.