feat: allow events with zero posten

refs #22

web/src/models/event_changeset.rs

@@ -24,7 +24,7 @@ pub struct EventChangeset {
     pub voluntary_wachhabender: bool,
     #[garde(custom(can_unset_fuehrungsassistent))]
     pub voluntary_fuehrungsassistent: bool,
-    #[garde(range(min = ctx.as_ref().map(|c: &EventContext| c.amount_of_assigned_posten).unwrap_or(1), max = 100))]
+    #[garde(range(min = ctx.as_ref().map(|c: &EventContext| c.amount_of_assigned_posten).unwrap_or(0), max = 100))]
     pub amount_of_posten: i16,
     pub clothing: String,
     pub note: Option<String>,

web/templates/events/new_or_edit.html

@@ -163,7 +163,7 @@
               {% let posten_planned = event.is_some() && amount_of_planned_posten > 0 %}
               <div class="control">
                 <input class="input" type="number" name="amount"
-                  min="{% if posten_planned %}{{ amount_of_planned_posten }}{% else %}1{% endif %}" max="100" required
+                  min="{% if posten_planned %}{{ amount_of_planned_posten }}{% else %}0{% endif %}" max="100" required
                   {% if let Some(event)=event %} value="{{ event.amount_of_posten }}" {% endif %} {{
                   disabled|cond_show("disabled") }} />
               </div>