Bugfix for all column and temporal action

[dorisjlee]

Several bugfixes for the new COVID HPI demo:

• For all column vis, display only if more than one column (i.e., not series), since visualization is a duplicate of series vis

  • Before:

  • After:

• For temporal, when there is only a single data point for a date, display a single bar instead of a line chart, since it is not possible to display a line chart with only a single data point.

  • Before:

  • After:

[codecov[bot]]

Codecov Report

Merging #373 (3c8da4c) into master (6bda76b) will increase coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #373      +/-   ##
==========================================
+ Coverage   84.85%   84.96%   +0.11%     
==========================================
  Files          52       52              
  Lines        4007     4017      +10     
==========================================
+ Hits         3400     3413      +13     
+ Misses        607      604       -3     

Impacted Files	Coverage Δ
lux/core/frame.py	82.06% <100.00%> (ø)
lux/processor/Compiler.py	98.05% <100.00%> (+0.03%)	:arrow_up:
lux/vislib/altair/BarChart.py	86.11% <100.00%> (+1.26%)	:arrow_up:
lux/vislib/altair/LineChart.py	82.97% <100.00%> (-0.36%)	:arrow_down:
lux/vislib/matplotlib/Heatmap.py	96.66% <0.00%> (ø)
lux/vislib/matplotlib/ScatterChart.py	76.47% <0.00%> (+1.17%)	:arrow_up:
lux/vislib/altair/ScatterChart.py	96.96% <0.00%> (+3.03%)	:arrow_up:
lux/vislib/altair/Heatmap.py	96.55% <0.00%> (+3.44%)	:arrow_up:

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