Refs #14984 Initialize ParameterValues if empty string

Workflow looks good and easy to follow considering the complexity of this algorithm. Happy to merge this as it is.

Merge pull request #14966 from mantidproject/14947_fix_open_table_query_loop_reflectometry_interface

Duplicate signal connections created query loop in Reflectometry Polref GUI

Enable ExportTimeSeriesLog to export partial time series.

Pass MaxIteration from fit browser to sequential dialog.

ExtractUnmaskedSpectra algorithm.

Merge pull request #14912 from mantidproject/14905_make_icat_searcher_run_parallel_to_ReflMainPresenter

Refl GUI searches ICAT Asynchronously

Merge branch 'master' of github.com:mantidproject/mantid into 14947_fix_open_table_query_loop_reflectometry_interface

Clean up LoadVesuvio

Refs #14947

Colour scale autoscaling in SliceViewer and ColorFill plots

Refs #14947

Refs #14905

Workflow diagram added for SANSStitch Algorithm

Make python versions 2.7 and 2.6 be found instead of python 3.

Move VSI to ParaView v5.0.0-RC1

This make QTcreator stop thinking there is an issue.

Surface and contour plots versus log values from workspace groups 

Usage tracking of algorithms

The changes are good.  PR thus is closed.

Refs #14947

This requires at least ParaView v5.0.0 plus a patch to the VTK class
vtkMatplotlibMathTextUtilities.cxx that has been submitted upstream.

Refs #14878

Fix system test ImagingIMATTomoScripts for older numpy

These options should only be shown on the right-click menu if a single
WorkspaceGroup has been clicked on. If multiple groups are selected, do
not show the options.

Refs #14905

Merge pull request #14942 from mantidproject/14932_allow_user_to_rotate_source_after_reflReductionOne_has_run

Allow user to rotate source to a different position after ReflectometryReduction has run