repoinit: add support for empty parameters list being ','
repoinit: add support for empty parameters list being ','

Change-Id: Id6fd0cf1e7a9c58b6b6adfd06628c4ec3fc718ce
Signed-off-by: Adrian DC <01fb3892f39957945220431e7409156544d2f041@gmail.com>

AdrianDC/android_development_shell_tools,AdrianDC/android_development_shell_tools