Fix crash when the context is not accessible

app/src/main/java/net/pokeranalytics/android/ui/fragment/StatsFragment.kt

@@ -178,11 +178,11 @@ class StatsFragment : SessionObserverFragment(), StaticRowRepresentableDataSourc
 		Timber.d(">>> filtering in ${duration} seconds")
 
         val allStats: List<Stat> = listOf(Stat.NETRESULT, Stat.HOURLY_RATE, Stat.AVERAGE, Stat.NUMBER_OF_SETS, Stat.AVERAGE_DURATION, Stat.DURATION)
-        val allSessionGroup = ComputableGroup(getString(R.string.all), allSessions, allSessionSets, allStats)
+        val allSessionGroup = ComputableGroup(stringAll, allSessions, allSessionSets, allStats)
         val cgStats: List<Stat> = listOf(Stat.NETRESULT, Stat.HOURLY_RATE, Stat.NET_BB_PER_100_HANDS, Stat.HOURLY_RATE_BB, Stat.AVERAGE, Stat.STANDARD_DEVIATION_HOURLY, Stat.WIN_RATIO, Stat.NUMBER_OF_GAMES, Stat.AVERAGE_BUYIN)
-        val cgSessionGroup = ComputableGroup(getString(R.string.cash_game), cgSessions, cgSessionSets, cgStats)
+        val cgSessionGroup = ComputableGroup(stringCashGame, cgSessions, cgSessionSets, cgStats)
         val tStats: List<Stat> = listOf(Stat.NETRESULT, Stat.HOURLY_RATE, Stat.ROI, Stat.WIN_RATIO, Stat.NUMBER_OF_GAMES, Stat.AVERAGE_BUYIN)
-        val tSessionGroup = ComputableGroup(getString(R.string.tournament), tSessions, tSessionSets, tStats)
+        val tSessionGroup = ComputableGroup(stringTournament, tSessions, tSessionSets, tStats)
 
         Timber.d(">>>>> Start computations...")