Hide columns without values in files listings

[fiskus]

• Hide "modified date" column if empty. We can fix backend model separately ("Size" column is also hidden in directories without files)
• Fixed text aligning for Size column in Packages tab

[codecov]

Codecov Report

Merging #3512 (a07fa43) into master (398e3fc) will increase coverage by 52.93%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #3512       +/-   ##
===========================================
+ Coverage   36.15%   89.09%   +52.93%     
===========================================
  Files         675       79      -596     
  Lines       29705     9839    -19866     
  Branches     4350        0     -4350     
===========================================
- Hits        10740     8766     -1974     
+ Misses      17806     1073    -16733     
+ Partials     1159        0     -1159     

Flag	Coverage Δ
api-python	91.22% <ø> (-0.13%)	⬇️
catalog	?
lambda	86.03% <ø> (ø)

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see 599 files with indirect coverage changes

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