fix(es): Fix a crash related to source map (#7307)

**Related issue:**

 - Reverts #7229.
 - Closes #7301.

Author: kdy1

Cargo.lock

@@ -545,8 +545,10 @@ fn extend_source_map(
     let mut source_map = sourcemap::SourceMap::from_reader(source_map.as_bytes())
         .context("failed to encode source map")?;
 
-    if let Some(ref source_file_name) = source_file_name {
-        source_map.set_source(0u32, source_file_name);
+    if !source_map.get_token_count() != 0 {
+        if let Some(ref source_file_name) = source_file_name {
+            source_map.set_source(0u32, source_file_name);
+        }
     }
 
     if source_root.is_some() {

bindings/swc_cli/src/commands/compile.rs

@@ -558,7 +558,7 @@ impl Compiler {
 
             let (code, map) = match source_map {
                 SourceMapsConfig::Bool(v) => {
-                    if v && !src_map_buf.is_empty() {
+                    if v {
                         let mut buf = vec![];
 
                         self.cm