Alias#to_string: Don't format `name` if it's empty

When we get a "From: " address that doesn't contain a name, the
resulting `Alias` object created by `Alias::new` will have an empty
name.

When `to_string` is called on these kinds of objects, an extra space
appears between the alias and the email address because of how the
format string is constructed.

This caused a test failure for the `new_alias_with_only_email` test
method in fc05eb9e2f111642dbec093218b7184f25740b90. Our change here
fixes and passes this test.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 27b3e48..49c30d3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -41,7 +41,11 @@ impl Alias {
     }
 
     fn to_string(&self) -> String {
-        format!("alias {} {} {}", self.alias, self.name, self.email)
+        if self.name.is_empty() {
+            format!("alias {} {}", self.alias, self.email)
+        } else {
+            format!("alias {} {} {}", self.alias, self.name, self.email)
+        }
     }
 }