Removing repeatable values in DescribeStep does not properly test for authority control

Attempting to remove a repeatable parameter of input type "name" in DescribeStep causes the following exception to be thrown (exception only thrown in JSPUI, though the problem exists in org.dspace.submit.step.DescribeStep) unless that value is configured for authority control:

ERROR org.dspace.app.webui.servlet.SubmissionController @ Error loading step class'org.dspace.submit.step.DescribeStep':
java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
at java.util.LinkedList.entry(LinkedList.java:365)
at java.util.LinkedList.remove(LinkedList.java:357)
at org.dspace.submit.step.DescribeStep.readNames(DescribeStep.java:538)

The linked list removals for "auth" and "conf" need to be wrapped in an if(isAuthorityControlled) test

Similar problems exist in readText, and possibly other methods. Will submit a patch after some more testing.