Print empty min/max strings in quotes (See #11472)

`bin/omero script params` was being misleading by showing
no value for min/max of String arguments when the min or
max was the empty string. This adds single quotes to the
empty string to make it clear that a min or max is present.
Fix flake8 warning
Merge pull request #2572 from will-moore/numpy_float32_issue-2547

Use numpy.float32 for PixelsType 'float'
Merge pull request #2574 from jburel/rebased/dev_5_0/selection-develop

Selection develop (rebased onto dev_5_0)
merge dev_5_0 -D org: PR 2542 (Fix managed rawfilestore)
merge dev_5_0 -D org: PR 2549 (Orphaned missing)
merge dev_5_0 -D org: PR 2563 (Update dev_5_0 submodules)
merge dev_5_0 -D org: PR 2566 (Artifactory deploy)
merge dev_5_0 -D org: PR 2570 (Add integration tests for CLI import as)
merge dev_5_0 -D org: PR 2578 (Truncate js tree dynamically 12161 (rebased onto dev_5_0))
merge dev_5_0 -D org: PR 2582 (11472 empty min max string)
merge dev_5_0 -D org

Repository: openmicroscopy/openmicroscopy
Excluded PRs:
  # PR 2581 joshmoore 'Add metrics' (status: failure)
  # PR 2437 joshmoore 'Docker-based Processor' (label: exclude)
  # PR 2242 joshmoore 'Use mklink under Windows' (label: exclude)
  # PR 2108 rleigh-dundee 'release-src includes bioformats version metadata' (label: exclude)
  # PR 2228 jburel 'Connection scifio' (label: exclude)
Already up-to-date.

Merged PRs:
  # PR 2542 joshmoore 'Fix managed rawfilestore'
  # PR 2549 jburel 'Orphaned missing'
  # PR 2563 snoopycrimecop 'Update dev_5_0 submodules'
  # PR 2566 joshmoore 'Artifactory deploy'
  # PR 2570 sbesson 'Add integration tests for CLI import as'
  # PR 2578 will-moore 'Truncate js tree dynamically 12161 (rebased onto dev_5_0)'
  # PR 2582 joshmoore '11472 empty min max string'

Repository: openmicroscopy/bioformats
Excluded PRs:
  # PR 1140 hflynn 'Add 'show and edit on Github' to docs side menu' (status: )
Already up-to-date.

Merged PRs:
  # PR 1134 sbesson 'Add prefix to zip file produced by dist-bftools target'
  # PR 1139 imunro 'Fix for BH .Sdt meas mode 0 & 1 single pixel files & (unrelated) problem with dividing by increment count.'
  # PR 1143 joshmoore 'Memoizer errs'
  # PR 1144 hflynn 'Updating Zeiss links'
  # PR 1146 sbesson 'bfsave: metadata improvements'

Repository: ome/scripts
Already up-to-date.

Repository: openmicroscopy/ome-documentation
Excluded PRs:
  # PR 811 will-moore 'Webgateway mip 5150' (status: )
Updating c858dcf..fb7eaf8
Merged PRs (fast-forward):
  # PR 804 hflynn 'Adding example server setup page '
  # PR 808 sbesson 'Travis fix'

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