Resource empty text: content-declared, and null counts as empty

A `.[] | {...}` jq over an empty list yields no output, which arrived
as null and rendered nothing - redoal's Releases feature was a bare
heading. Null now reads as the same silence as [], and ResourceSpec
gains `empty:` so content can word it ("Nothing released yet");
default stays "Nothing here yet."

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/app.rs

@@ -900,6 +900,7 @@ fn AlternativeCard(
                                                 alternative=alt_name.clone()
                                                 feature_name=feature_name.clone()
                                                 transitions=spec.transitions.clone()
+                                                empty=spec.empty.clone()
                                                 pending_transitions=pending_transitions
                                                 transition_batch=transition_batch
                                             />
@@ -1219,6 +1220,7 @@ fn ResourceFeature(
     alternative: String,
     feature_name: String,
     transitions: Vec<Transition>,
+    empty: Option<String>,
     pending_transitions: RwSignal<std::collections::HashMap<(String, String), String>>,
     transition_batch: ServerAction<TransitionAnswers>,
 ) -> impl IntoView {
@@ -1252,6 +1254,7 @@ fn ResourceFeature(
                 {move || {
                     let feature_name = feature_name.clone();
                     let transitions = transitions.clone();
+                    let empty = empty.clone().unwrap_or_else(|| "Nothing here yet.".to_string());
                     data.get()
                         .map(|res| match res {
                             Ok(value) => {
@@ -1259,6 +1262,7 @@ fn ResourceFeature(
                                     <ResourceValue
                                         feature_name=feature_name
                                         transitions=transitions
+                                        empty=empty
                                         value=value
                                         pending_transitions=pending_transitions
                                         transition_batch=transition_batch
@@ -1285,10 +1289,16 @@ fn ResourceFeature(
 fn ResourceValue(
     feature_name: String,
     transitions: Vec<Transition>,
+    empty: String,
     value: serde_json::Value,
     pending_transitions: RwSignal<std::collections::HashMap<(String, String), String>>,
     transition_batch: ServerAction<TransitionAnswers>,
 ) -> impl IntoView {
+    // A jq like `.[] | {...}` over an empty list yields no output at
+    // all - that arrives as null, and it's the same silence as [].
+    if value.is_null() {
+        return view! { <p class="resource-empty">{empty}</p> }.into_any();
+    }
     if let serde_json::Value::Array(items) = &value {
         if let Ok(answers) = serde_json::from_value::<Vec<Answer>>(value.clone()) {
             let mut answers = answers;
@@ -1323,7 +1333,7 @@ fn ResourceValue(
             .into_any();
         }
         if items.is_empty() {
-            return view! { <p class="resource-empty">"Nothing here yet."</p> }.into_any();
+            return view! { <p class="resource-empty">{empty}</p> }.into_any();
         }
         // A list of plain objects (e.g. a jq-shaped GiteaStarred/Url
         // resource) - render as cards rather than dumping raw JSON.

src/content.rs

@@ -202,6 +202,12 @@ pub struct ResourceSpec {
     /// `.[] | {name, url: .html_url}`. `None` returns it as-is.
     #[serde(default)]
     pub jq: Option<String>,
+    /// What to say when the resource yields nothing - an empty list,
+    /// or `null` (a `.[] | ...` jq over an empty list produces no
+    /// output at all). Defaults to "Nothing here yet."; content sets
+    /// it where the silence needs a voice ("Nothing released yet").
+    #[serde(default)]
+    pub empty: Option<String>,
 }
 
 /// Where a resource's live data comes from. `Kv` (a NATS KV bucket