Fix basic hourly and weekly recurrence

app/src/main/java/com/todoroo/astrid/repeats/RepeatTaskHelper.kt

@@ -154,7 +154,7 @@ class RepeatTaskHelper @Inject constructor(
                 recur: Recur, original: DateTime, hasDueTime: Boolean): Long {
             val byDay = recur.dayList
             var newDate = original.millis
-            newDate += DateUtilities.ONE_WEEK * (recur.interval - 1)
+            newDate += DateUtilities.ONE_WEEK * (recur.interval.coerceAtLeast(1) - 1)
             var date = DateTime(newDate)
             Collections.sort(byDay, weekdayCompare)
             val next = findNextWeekday(byDay, date)
@@ -263,7 +263,7 @@ class RepeatTaskHelper @Inject constructor(
                 else -> throw RuntimeException(
                         "Error handing subday repeat: " + recur.frequency) // $NON-NLS-1$
             }
-            val newDueDate = startDate.millis + millis * recur.interval
+            val newDueDate = startDate.millis + millis * recur.interval.coerceAtLeast(1)
             return createDueDate(Task.URGENCY_SPECIFIC_DAY_TIME, newDueDate)
         }