Change ShellError for headers, Add sample_headers file to utils.rs

crates/nu-cli/src/commands/headers.rs

@@ -52,7 +52,7 @@ pub fn headers(
                     }
                 }).collect())
             }
-                _ => Err(ShellError::untagged_runtime_error("Couldn't find all headers, was the input a properly formatted, non-empty table?")),
+            _ => Err(ShellError::unexpected_eof("Could not get headers, is the table empty?", rows[0].tag.span))
         }?;
 
         //Each row is a dictionary with the headers as keys
@@ -67,7 +67,7 @@ pub fn headers(
                     }
                     yield Ok(ReturnSuccess::Value(UntaggedValue::Row(Dictionary{entries}).into_value(r.tag.clone())))
                 }
-                _ => yield Err(ShellError::untagged_runtime_error("Couldn't iterate through rows, was the input a properly formatted table?"))
+                _ => yield Err(ShellError::unexpected_eof("Couldn't iterate through rows, was the input a properly formatted table?", r.tag.span))
             }
         }
     };

crates/nu-cli/src/utils.rs

@@ -317,6 +317,10 @@ mod tests {
                     loc: fixtures().join("sample_data.xlsx"),
                     at: 0
                 },
+                Res {
+                    loc: fixtures().join("sample_headers.xlsx"),
+                    at: 0
+                },
                 Res {
                     loc: fixtures().join("script.nu"),
                     at: 0