Support zip generation fails without a blobstore

Nexus admins cannot create a support zip if there is no blobstore present. Per the nexus.log:

2018-11-12 16:10:10,285+0000 INFO [qtp1301159914-189] admin com.sonatype.nexus.hazelcast.internal.BlobStoreDownloadServiceImpl - Move: support-20181112-161009-3.zip
2018-11-12 16:10:10,286+0000 ERROR [qtp1301159914-189] admin org.sonatype.nexus.extdirect.internal.ExtDirectServlet - Failed to invoke action method: atlas_SupportZip.create, java-method: org.sonatype.nexus.coreui.internal.atlas.SupportZipComponent.create
java.util.NoSuchElementException: null
 at com.google.common.collect.AbstractIndexedListIterator.next(AbstractIndexedListIterator.java:75)
 at com.sonatype.nexus.hazelcast.internal.BlobStoreDownloadServiceImpl.move(BlobStoreDownloadServiceImpl.java:108)*
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:498)
 at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrap.invoke(PojoMetaMethodSite.java:213)
 at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:56)
 at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:136)
 at org.sonatype.nexus.internal.atlas.SupportZipGeneratorImpl.generate(SupportZipGeneratorImpl.groovy:151)
 at org.sonatype.nexus.supportzip.SupportZipGenerator$generate.call(Unknown Source)
 at org.sonatype.nexus.coreui.internal.atlas.SupportZipComponent.create(SupportZipComponent.groovy:57)

New Nexus HA-C environments don't have blobstores, which means we can't get support zips to troubleshoot issues encountered early on.