Allow sharing something to chat without a message

src/app/components/RoomCompose.svelte

@@ -68,8 +68,6 @@
     const content = ed.getText({blockSeparator: "\n"}).trim()
     const tags = ed.storage.nostr.getEditorTags()
 
-    if (!content) return
-
     onSubmit({content, tags})
 
     draftKey?.clear()

src/routes/spaces/[relay]/[h]/+page.svelte

@@ -156,6 +156,10 @@
   }
 
   const onSubmit = async ({content, tags}: EventContent) => {
+    if (!content && !share) {
+      return
+    }
+
     try {
       tags.push(["h", h])
 

src/routes/spaces/[relay]/chat/+page.svelte

@@ -57,6 +57,10 @@
   }
 
   const onSubmit = async ({content, tags}: EventContent) => {
+    if (!content && !share) {
+      return
+    }
+
     try {
       let template: EventContent & {created_at?: number} = {content, tags}