Fixed a reverse label null check

[gaspardpetit]

I'm not sure what the impact of this really is - but the check is definitely reversed.

if (requiredResources.label != null && requiredResources.label.isEmpty())

should have been:

if (requiredResources.label == null || requiredResources.label.isEmpty())

But I fixed it with a StringUtils.isBlank(requiredResources.label)

I notice the plugin has a lot of x == null || x.isEmpty() or similar and would encourage to use StringUtils.isBlank and StringUtils.isNotBlank for these checks. They are far less error-prone and easier to read.

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[gaspardpetit]

From what I see, label will never be null - (it is set to "" when it is) so this change should have no impact (other than making the check semantically correct)

[basil]

Released in 2.15.