205 fix mini panic

[apzuk3]

Issue #205

Description of changes:

Came across this bug the other day and spent quite a long time to figure out what's going on because it is really confusing.

So this is a fix proposal to check if the av.dataType is not DataTypeString return the string representation of the struct, panic otherwise

[codecov-io]

Codecov Report

Merging #226 into master will decrease coverage by 0.11%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #226      +/-   ##
==========================================
- Coverage   74.55%   74.44%   -0.12%     
==========================================
  Files          20       20              
  Lines         676      677       +1     
==========================================
  Hits          504      504              
- Misses        127      128       +1     
  Partials       45       45

Impacted Files	Coverage Δ
events/attributevalue.go	82.51% <66.66%> (-0.29%)	⬇️

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