fix(connector): [Paypal]fix paypal error reason mapping when it is empty string. (#2700)

Author: srujanchikke

crates/router/src/connector/paypal.rs

@@ -190,10 +190,13 @@ impl ConnectorCommon for Paypal {
                     })
             })
             .transpose()?;
-        let reason = error_reason
-            .unwrap_or(response.message.to_owned())
-            .is_empty()
-            .then_some(response.message.to_owned());
+        let reason = match error_reason {
+            Some(err_reason) => err_reason
+                .is_empty()
+                .then(|| response.message.to_owned())
+                .or(Some(err_reason)),
+            None => Some(response.message.to_owned()),
+        };
 
         Ok(ErrorResponse {
             status_code: res.status_code,