[TYPO3-shop] Weight without decimal places (T3 <4.2.3; tt_prod v1.7.1)

[Franz Gutsch]

Hello, I'm new to this group.

I've got a Problem entering the products' weight in Backend. Saving a 
product record always pads the value with several decimal places.
The marker ###PRODUCT_WEIGHT### displays the weight like this: 
"50.000000 g". I want the output to look like this: "50 g".
This issue emerged in T3v4.2.4 and is not solved by v4.2.5. I use 
tt_products v1.7.1

btw: is there any complete reference for the markers to use in the 
html-template?

Greetings

Franz (Gutsch)