feat(selector): add SelectorError::MissingChangeSatisfactionWeight

Author: nymius

src/selector.rs

@@ -279,13 +279,19 @@ pub enum SelectorError {
     Miniscript(miniscript::Error),
     /// meeting the target is not possible
     CannotMeetTarget(CannotMeetTarget),
+    /// missing weight to satisfy change output
+    MissingChangeSatisfactionWeight,
 }
 
 impl fmt::Display for SelectorError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Self::Miniscript(err) => write!(f, "{err}"),
             Self::CannotMeetTarget(err) => write!(f, "{err}"),
+            Self::MissingChangeSatisfactionWeight => write!(
+                f,
+                "Cannot determinate change policy without satisfaction weight"
+            ),
         }
     }
 }