Match cleanup (#2294)

* Delete unnecessary match

* Use `unwrap_or_else()`

* Whitespace was trim on file save

* Use `map_or_else()`

* Use a default to group all match arms with same output

* Clippy made me do it

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

@@ -237,10 +237,7 @@ pub fn group(
             crate::utils::data::group(&values, &Some(block), &name)
         }
         Grouper::ByColumn(None) => {
-            let block = Box::new(move |_, row: &Value| match as_string(row) {
-                Ok(group_key) => Ok(group_key),
-                Err(reason) => Err(reason),
-            });
+            let block = Box::new(move |_, row: &Value| as_string(row));
 
             crate::utils::data::group(&values, &Some(block), &name)
         }

crates/nu-cli/src/data/dict.rs

@@ -54,14 +54,10 @@ impl DictionaryExt for Dictionary {
     }
 
     fn get_mut_data_by_key(&mut self, name: &str) -> Option<&mut Value> {
-        match self
-            .entries
+        self.entries
             .iter_mut()
             .find(|(desc_name, _)| *desc_name == name)
-        {
-            Some((_, v)) => Some(v),
-            None => None,
-        }
+            .map_or_else(|| None, |x| Some(x.1))
     }
 
     fn insert_data_at_key(&mut self, name: &str, value: Value) {