added catch block to capture resource not found exception (#460)

Co-authored-by: NomanShoaib <[email protected]>

android-sdk/src/main/java/com/optimizely/ab/android/sdk/OptimizelyManager.java

@@ -364,7 +364,7 @@ public String getDatafile(Context context,@RawRes Integer datafileRes){
                 }
             }
             return safeLoadResource(context, datafileRes);
-        } catch (NullPointerException e){
+        } catch (NullPointerException | Resources.NotFoundException e){
             logger.error("Unable to find compiled data file in raw resource",e);
         }
         return null;