Trailing comma in unpackTypes causes empty string element and confusing error

[elharo]

Description

In EarMojo.java:460, a trailing comma in the unpackTypes parameter produces an empty string element:

unpackTypesList = Arrays.asList(unpackTypes.split(","));

If the user configures unpackTypes = "jar,war,", split(",") produces the array ["jar", "war", ""]. The empty string "" will fail isStandardArtifactType() and produce a confusing error message.

Expected behavior

Filter out empty strings: