Merge pull request #1296 from rkuslak/master

Fix comparison of empty string to numeric f64 sort

src/sort/sort.rs

@@ -383,13 +383,17 @@ fn permissive_f64_parse(a: &str) -> f64 {
     // because there's no way to handle both CSV and thousands separators without a new flag.
     // GNU sort treats "1,234" as "1" in numeric, so maybe it's fine.
     // GNU sort treats "NaN" as non-number in numeric, so it needs special care.
-    let sa: &str = a.split_whitespace().next().unwrap();
+    match a.split_whitespace().next() {
+        None => std::f64::NEG_INFINITY,
+        Some(sa) => {
             match sa.parse::<f64>() {
                 Ok(a) if a.is_nan() => std::f64::NEG_INFINITY,
                 Ok(a) => a,
                 Err(_) => std::f64::NEG_INFINITY,
             }
         }
+    }
+}
 
 /// Compares two floating point numbers, with errors being assumed to be -inf.
 /// Stops coercing at the first whitespace char, so 1e2 will parse as 100 but