jobs can also have indeterminate progress

src/util/jobs.rs

@@ -7,7 +7,7 @@ use uuid::Uuid;
 pub struct Job {
     pub job_type: Option<JobType>,
     pub title: String,
-    pub progress: f32,
+    pub progress: Option<f32>,
     pub state: State,
 }
 
@@ -94,7 +94,7 @@ impl JobContainer {
 
     pub fn update_progress(&mut self, id: &JobId, progress: f32) -> Result<()> {
         if let Some(job) = self.jobs.get_mut(id) {
-            job.progress = progress;
+            job.progress = Some(progress);
             if progress >= 100.0 {
                 job.state = State::Done;
             }