Deal with issues in invalid recurrence state

src/scheduler.rs

@@ -9,15 +9,22 @@ pub async fn reschedule_recurring_tasks(
 ) -> anyhow::Result<()> {
     let mut rescheduled = 0;
     for task in tasks {
-        let task::State::Completed {
+        let Some(recurring) = &task.recurring else {
-            date: completed_date,
-        } = &task.state
-        else {
             continue;
         };
 
-        let Some(recurring) = &task.recurring else {
+        let completed_date = match &task.state {
-            continue;
+            // Already scheduled
+            task::State::Open { due: Some(_) } => continue,
+
+            // Invalid state, will warn about this
+            task::State::Open { due: None } => {
+                log::warn!("Task {task} is recurring but has no due date. Updating from today.");
+                &jiff::Zoned::now()
+            }
+
+            // Need scheduling
+            task::State::Completed { date } => date,
         };
 
         let due_date = next_due_date(completed_date, recurring.interval);