Ensure UPDATE table:id MERGE {} works correctly (#4040)

Co-authored-by: Rushmore Mushambi <rushmore@surrealdb.com>

core/src/sql/value/every.rs

@@ -52,8 +52,10 @@ impl Value {
 					false => vec![prev],
 				}
 			}
-			// Process everything else
-			_ => vec![prev],
+			// Process every other path
+			_ if !prev.is_empty() => vec![prev],
+			// Nothing to do
+			_ => vec![],
 		}
 	}
 }
@@ -64,6 +66,13 @@ mod tests {
 	use super::*;
 	use crate::syn::Parse;
 
+	#[test]
+	fn every_empty() {
+		let val = Value::parse("{}");
+		let res: Vec<Idiom> = vec![];
+		assert_eq!(res, val.every(None, false, false));
+	}
+
 	#[test]
 	fn every_with_empty_objects_arrays() {
 		let val = Value::parse("{ test: {}, status: false, something: {age: 45}, tags: []}");

core/src/sql/value/merge.rs

@@ -30,6 +30,7 @@ mod tests {
 	async fn merge_none() {
 		let mut res = Value::parse(
 			"{
+				test: true,
 				name: {
 					first: 'Tobie',
 					last: 'Morgan Hitchcock',
@@ -46,10 +47,38 @@ mod tests {
 		}
 	}
 
+	#[tokio::test]
+	async fn merge_empty() {
+		let mut res = Value::parse(
+			"{
+				test: true,
+				name: {
+					first: 'Tobie',
+					last: 'Morgan Hitchcock',
+					initials: 'TMH',
+				},
+			}",
+		);
+		let val = Value::parse(
+			"{
+				test: true,
+				name: {
+					first: 'Tobie',
+					last: 'Morgan Hitchcock',
+					initials: 'TMH',
+				},
+			}",
+		);
+		let mrg = Value::Object(Default::default());
+		res.merge(mrg).unwrap();
+		assert_eq!(res, val);
+	}
+
 	#[tokio::test]
 	async fn merge_basic() {
 		let mut res = Value::parse(
 			"{
+				test: true,
 				name: {
 					first: 'Tobie',
 					last: 'Morgan Hitchcock',
@@ -68,6 +97,7 @@ mod tests {
 		);
 		let val = Value::parse(
 			"{
+				test: true,
 				name: {
 					title: 'Mr',
 					first: 'Tobie',