Properly fixing #257 and helps out on #324

[twmobius]

I think this properly solves #257 replacing method_exists with is_callable as well as empty tables being generated.

[Progi1984]

@twmobius Hi, could you

• point your PR to the develop branch ?
• add your contribution to the file CHANGELOG.MD ?
• correct these CS errors : https://travis-ci.org/PHPOffice/PHPWord/jobs/40542340#L511 ?
• answer to @ugomeda on your way ?

[twmobius]

@Progi1984 I'll try and get that in the next couple of days.

@ugomeda It has been mentioned on #324 by @mogilvie that "The problem is that HTML elements <tbody> <tr> and <td> are not DOMElements as defined by the Abstract Container class. Because these HTML elements are not DOM Abstract Containers the parseChildNodes method doesnt check for any child elements." But at the same time the don't have the addText method, thus it need checking before calling

[Progi1984]

@twmobius Some news ?

[garethellis36]

If @twmobius no longer has time or motivation to fix this PR, does anyone object if I take his changes, add @Progi1984 's proposed fixes above and submit a fresh PR? I could really use the ability to add <table> HTML

[Progi1984]

👍

[troosan]

closing as continued in #724