From 141c8d8f4fab47f28a00010c18dff135bc2fb56e Mon Sep 17 00:00:00 2001
From: Christian Beilschmidt <christian.beilschmidt@geoengine.de>
Date: Mon, 31 Oct 2022 11:55:40 +0100
Subject: [PATCH] stop reading error messages if they were not set

---
 src/driver.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/driver.rs b/src/driver.rs
index 5dae5425..b8087b84 100644
--- a/src/driver.rs
+++ b/src/driver.rs
@@ -400,7 +400,11 @@ impl DriverManager {
         _register_drivers();
         let c_driver = unsafe { gdal_sys::GDALGetDriver(index.try_into().unwrap()) };
         if c_driver.is_null() {
-            return Err(_last_null_pointer_err("GDALGetDriver"));
+            // `GDALGetDriver` just returns `null` and sets no error message
+            return Err(GdalError::NullPointer {
+                method_name: "GDALGetDriver",
+                msg: "Unable to find driver".to_string(),
+            });
         }
         Ok(Driver { c_driver })
     }
@@ -427,7 +431,11 @@ impl DriverManager {
         let c_name = CString::new(name)?;
         let c_driver = unsafe { gdal_sys::GDALGetDriverByName(c_name.as_ptr()) };
         if c_driver.is_null() {
-            return Err(_last_null_pointer_err("GDALGetDriverByName"));
+            // `GDALGetDriverByName` just returns `null` and sets no error message
+            return Err(GdalError::NullPointer {
+                method_name: "GDALGetDriverByName",
+                msg: "Unable to find driver".to_string(),
+            });
         };
         Ok(Driver { c_driver })
     }