The presence of "disabled" in a HTML tag
is sufficient to disable it.
Assigning a value has no effect.

added GitlabService.java to offer basic gitlab api functionalities like check if repo exists etc. , added check in StatisticsResource to avoid people sending get requests with IDs which not exist and therefore create lots of trash entities

The presence of the "disabled" attribute
in a HTML tag is enough to disable it.
It does not take a value.