schema: Print an error if the qsv stats invocation fails

Aborts if either
* the stats process is killed (e.g. SIGKIL due to memory pressure)
* or the stats process returns a non-zero return code

src/util.rs

@@ -2080,7 +2080,23 @@ pub fn get_stats_records(
         let qsv_bin = std::env::current_exe().unwrap();
         let mut stats_cmd = std::process::Command::new(qsv_bin);
         stats_cmd.args(stats_args_vec);
-        let _stats_output = stats_cmd.output()?;
+        let status = stats_cmd.output()?.status;
+        let status_code = status.code();
+        if status_code.is_none() {
+            if let Some(signal) = status.signal() {
+                return Err(CliError::Other(
+                    format!("qsv stats terminated with signal: {}", signal).to_string(),
+                ));
+            } else {
+                return Err(CliError::Other(
+                    "qsv stats terminated by unknown cause".to_string(),
+                ));
+            }
+        } else if let Some(code) = status_code {
+            return Err(CliError::Other(
+                format!("qsv stats exited with code: {}", code).to_string(),
+            ));
+        }
 
         // create a statsdatajon from the output of the stats command
         csv_to_jsonl(