add transparent icon to fix compiling errors

packages/apps/PDroidManager/src/net/digitalfeed/pdroidalternative/ApplicationsDatabaseFillerTask.java:225: cannot find symbol
symbol  : variable raw
location: class net.digitalfeed.pdroidalternative.R
    				        blankIcon = IconHelper.getByteArray(context.getResources().openRawResource(R.raw.blank));
    				                                                                                    ^
packages/apps/PDroidManager/src/net/digitalfeed/pdroidalternative/ApplicationsDatabaseFillerTask.java:231: cannot find symbol
symbol  : variable raw
location: class net.digitalfeed.pdroidalternative.R
                        blankIcon = IconHelper.getByteArray(context.getResources().openRawResource(R.raw.blank));
                                                                                                    ^