CommandLine 'toProcess.length() == 0' can be replaced with 'toProcess.isEmpty()'

[manusa]

Description

The call to String.length can be replaced with isEmpty in CommandLine.

The following line:

jkube/jkube-kit/common/src/main/java/org/eclipse/jkube/kit/common/util/CommandLine.java

Line 28 in 5ca316e

if (toProcess == null || toProcess.length() == 0) {

should be changed to:

        if (toProcess == null || toProcess.isEmpty()) {

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