Service don t start anymore, as smallIconName extra is now mandatory

[brvier]

python-for-android/pythonforandroid/bootstraps/common/build/src/main/java/org/kivy/android/PythonService.java

Line 116 in 8cb497d

if (!smallIconName.equals("")){

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference

We could test if null before.