Migration to jon-server 3.2 issue - message "java.lang.RuntimeException: de-obfuscating db password failed" logged in the server.log file

Issue

• I'm not able to upgrade and I can see the following message in my server.log file:

DEBUG org.rhq.server.metrics.migrator.DataMigratorRunner  - Server configuration file system property detected. Loading the file: c:\jon-server-3.2.0\bin\rhq-server.properties
java.lang.RuntimeException: de-obfuscating db password failed:
        at org.rhq.core.util.obfuscation.PicketBoxObfuscator.decode(PicketBoxObfuscator.java:75)
        at org.rhq.server.metrics.migrator.DataMigratorRunner.loadConfigurationFromServerPropertiesFile(DataMigratorRunner.java:362)
        at org.rhq.server.metrics.migrator.DataMigratorRunner.configure(DataMigratorRunner.java:287)
        at org.rhq.server.metrics.migrator.DataMigratorRunner.main(DataMigratorRunner.java:170)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.jboss.modules.Module.run(Module.java:270)
        at org.jboss.modules.Main.main(Main.java:411)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.rhq.core.util.obfuscation.PicketBoxObfuscator.decode(PicketBoxObfuscator.java:72)
        ... 9 more
Caused by: java.lang.NumberFormatException: Zero length BigInteger
        at java.math.BigInteger.<init>(BigInteger.java:296)
        at org.picketbox.datasource.security.SecureIdentityLoginModule.decode(SecureIdentityLoginModule.java:170)
        ... 14 more
21:46:24,106 INFO  [org.rhq.server.control.command.Upgrade] The data migrator finished with exit value 0

• My initial attempt to upgrade to JBoss ON failed. I fixed the problem and tried again but this time I got new issue saying that "de-obfuscating db password failed". How can I resolve this?
• Migration to jon-server 3.2 issue - message "java.lang.RuntimeException: de-obfuscating db password failed" logged in the server.log file