fix: Import/Export: Import fails [dev]

[mprevide]

• Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)?

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• Is there any issue related to this PR in other repository? (such as dojot/dojot)
  Import/Export: Import fails if data already exists dojot#1480

• Other information:
  I just add @classmethod

[codecov]

Codecov Report

Merging #158 into development will not change coverage.
The diff coverage is 91.30%.

@@             Coverage Diff              @@
##           development     #158   +/-   ##
============================================
  Coverage        73.54%   73.54%           
============================================
  Files               17       17           
  Lines             1705     1705           
============================================
  Hits              1254     1254           
  Misses             451      451           

Impacted Files	Coverage Δ
DeviceManager/ImportHandler.py	83.55% <91.30%> (ø)

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[thiagodpf]

That was easy!
👍