fix(toml): Don't error on infostrings with trailing whitespace

Author: epage

src/cargo/util/toml/embedded.rs

@@ -245,8 +245,9 @@ fn split_source(input: &str) -> CargoResult<Source<'_>> {
         _ => source.content.split_at(fence_end),
     };
     let (info, content) = rest.split_once("\n").unwrap_or((rest, ""));
+    let info = info.trim_end();
     if !info.is_empty() {
-        source.info = Some(info.trim_end());
+        source.info = Some(info);
     }
     source.content = content;
 
@@ -431,9 +432,7 @@ Ok(
         shebang: Some(
             "#!/usr/bin/env cargo\r\n",
         ),
-        info: Some(
-            "",
-        ),
+        info: None,
         frontmatter: Some(
             "[dependencies]\r\ntime=\"0.1.25\"\r\n",
         ),