Allow empty params object from text-based WebSocket clients

Closes #1610

lib/src/sql/value/value.rs

@@ -601,6 +601,10 @@ impl Value {
 	// Simple value detection
 	// -----------------------------------
 
+	pub fn is_none_or_null(&self) -> bool {
+		matches!(self, Value::None | Value::Null)
+	}
+
 	pub fn is_none(&self) -> bool {
 		matches!(self, Value::None)
 	}

src/net/rpc.rs

@@ -290,7 +290,7 @@ impl Rpc {
 			},
 			// Run a full SurrealQL query against the database
 			"query" => match params.needs_one_or_two() {
-				Ok((Value::Strand(s), o)) if o.is_none() => {
+				Ok((Value::Strand(s), o)) if o.is_none_or_null() => {
 					return match rpc.read().await.query(s).await {
 						Ok(v) => res::success(id, v).send(out, chn).await,
 						Err(e) => {