sonar:UseCollectionIsEmpty inverts condition

[dalejunas]

UseCollectionIsEmpty violation fix inverts condition
from
if( list1.size() > 0 ){ ... }

to
if( list1.isEmpty() ){ ... }

[subisueno]

There are many other cases, which may fail.
Such as - if (0 < list.size)
list.size >= 1
etc.
Please refer to below link -
https://github.com/walkmod/walkmod-core/issues/73

The change is attached in this link. Can someone review the changes, and place the fix. As, I am not able to create pull request ?