Improve error message for undefined report formats on report detailspage

[swaterkamp]

Checklist:

• [N/A] Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2367 into gsa-20.08 will increase coverage by 0.16%.
The diff coverage is 85.34%.

@@              Coverage Diff              @@
##           gsa-20.08    #2367      +/-   ##
=============================================
+ Coverage      52.76%   52.92%   +0.16%     
=============================================
  Files           1070     1070              
  Lines          25789    25830      +41     
  Branches        7312     7356      +44     
=============================================
+ Hits           13607    13671      +64     
+ Misses         11058    11042      -16     
+ Partials        1124     1117       -7     

Impacted Files	Coverage Δ
gsa/src/gmp/commands/wizard.js	9.23% <0.00%> (ø)
gsa/src/web/components/error/errorpanel.js	100.00% <ø> (ø)
gsa/src/web/pages/cpes/details.js	11.11% <ø> (ø)
gsa/src/web/pages/extras/trashactions.js	5.49% <0.00%> (ø)
gsa/src/web/pages/hosts/dialog.js	50.00% <ø> (ø)
gsa/src/web/pages/policies/detailspage.js	100.00% <ø> (ø)
gsa/src/web/pages/policies/row.js	100.00% <ø> (ø)
gsa/src/web/pages/portlists/detailspage.js	34.48% <ø> (ø)
gsa/src/web/pages/portlists/row.js	55.55% <ø> (ø)
gsa/src/web/pages/reportformats/detailspage.js	33.33% <ø> (ø)
... and 29 more

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