NumberFormatException

[ape-report]

parseDouble will throw an exception if the input string is illegal.
For example, set an empty value for an upper limit in Alarm Settings.

03-30 23:14:03.244 27062 27062 D AndroidRuntime: Shutting down VM
03-30 23:14:03.244 27062 27062 E AndroidRuntime: FATAL EXCEPTION: main
03-30 23:14:03.244 27062 27062 E AndroidRuntime: Process: mobi.boilr.boilr, PID: 27062
03-30 23:14:03.244 27062 27062 E AndroidRuntime: java.lang.NumberFormatException: Invalid double: ""
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at java.lang.StringToReal.invalidReal(StringToReal.java:63)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at java.lang.StringToReal.parseDouble(StringToReal.java:267)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at java.lang.Double.parseDouble(Double.java:301)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at mobi.boilr.boilr.views.fragments.PriceHitAlarmSettingsFragment$OnPriceHitSettingsPreferenceChangeListener.onPreferenceChange(PriceHitAlarmSettingsFragment.java:25)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at android.preference.Preference.callChangeListener(Preference.java:939)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at android.preference.EditTextPreference.onDialogClosed(EditTextPreference.java:145)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at android.preference.DialogPreference.onDismiss(DialogPreference.java:395)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1323)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:102)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:148)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at android.app.ActivityThread.main(ActivityThread.java:5417)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at java.lang.reflect.Method.invoke(Native Method)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
03-30 23:14:03.244 27062 27062 E AndroidRuntime: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
03-30 23:14:03.246   778  4442 W ActivityManager:   Force finishing activity mobi.boilr.boilr/.activities.AlarmSettingsActivity