Skipped custom html tags

[nkhristinin]

Description

Fixed the bug, with empty html tags in source for Trans component.
Translators can (yes, they can) add some html tag into translations.

For example we had source

{
 "key" : "Some text <1>other text<1>"
}

But translations manager decide to add some tags in translations:
"Some text <br /> <1>other text<1>"

After that react-i18next throw the error

    TypeError: Cannot read property 'content' of undefined

      at src/Trans.js:78:86
          at Array.reduce (<anonymous>)

[coveralls]

Coverage increased (+0.1%) to 82.661% when pulling 7532331 on hrnik:master into 1dc13d3 on i18next:master.

[coveralls]

Coverage increased (+0.1%) to 82.661% when pulling 7532331 on hrnik:master into 1dc13d3 on i18next:master.

[jamuhl]

thanks for creating the PR. Will check this tomorrow and merge it. Just came back from a two day trip - so won't be able to pull it in before tomorrow.

[jamuhl]

thank you...published in react-i18next@7.9.1