Invalid argument when running Drush

The current implementation hook_drush_command() has a few syntax issues in it that generate invalid argument errors in PHP. To reproduce, run "drush help solr-vget". Note the errors, and the empty description for the "--format" flag.

$ drush help solr-variable-get

Invalid argument supplied for foreach() bootstrap.inc:1535                                                                     [warning]
strtr(): The second argument is not an array bootstrap.inc:1552                                                                [warning]
Invalid argument supplied for foreach() bootstrap.inc:1535                                                                     [warning]
strtr(): The second argument is not an array bootstrap.inc:1552                                                                [warning]
Invalid argument supplied for foreach() bootstrap.inc:1535                                                                     [warning]
strtr(): The second argument is not an array bootstrap.inc:1552                                                                [warning]
Invalid argument supplied for foreach() bootstrap.inc:1535                                                                     [warning]
strtr(): The second argument is not an array bootstrap.inc:1552                                                                [warning]
Get a list of Apache Solr environment variable names and values.

Examples:
 drush solr-vget                           List all variables and values.                   
 drush solr-vget user                      List all variables containing the string "user". 
...

Patch to fix attached!