hg: jdk/sandbox: 8251184: File association without description causes exception

[chris.hegarty at oracle.com]

Changeset: 9b5331135a8f
Author:    herrick
Date:      2020-08-07 11:42 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/9b5331135a8f

8251184: File association without description causes exception
Reviewed-by: asemenyuk, almatvee

! src/jdk.incubator.jpackage/share/classes/jdk/incubator/jpackage/internal/FileAssociation.java
! src/jdk.incubator.jpackage/share/classes/jdk/incubator/jpackage/internal/StandardBundlerParam.java
! test/jdk/tools/jpackage/helpers/jdk/jpackage/test/FileAssociations.java
! test/jdk/tools/jpackage/share/FileAssociationsTest.java