bundles/org.eclipse.packagedrone.repo.aspect.common/src/org/eclipse/packagedrone/repo/aspect/common/p2/InstallableUnit.java
private static void addProperty ( final Map<String, String> props, final String key, final String value )
    {
        if ( value == null )
        {
            return;
        }

        props.put ( key, value );
    }
private static void addProperty ( final Map<String, String> props, final String key, final String value )
    {
        if ( value == null )
        {
            return;
        }

        props.put ( key, value );
    }
Add property entry only of value is not null

@param props
properties
@param key
to add
@param value
to add