+ throw image_reader_exception if we can't read tiff file

+ catch image_reader_exceptions in raster.input
+ re-throw in bind()

plugins/input/raster/raster_datasource.cpp

@@ -111,9 +111,15 @@ void raster_datasource::bind() const
 #endif
         }
     }
+    catch (mapnik::image_reader_exception const& ex)
+    {
+        std::cerr << "Raster Plugin: image reader exception caught:" << ex.what() << std::endl;
+        throw;
+    }
     catch (...)
     {
         std::cerr << "Raster Plugin: exception caught" << std::endl;
+        throw;
     }
     
     is_bound_ = true;

plugins/input/raster/raster_featureset.cpp

@@ -102,6 +102,10 @@ feature_ptr raster_featureset<LookupPolicy>::next()
             }
          }
       }
+      catch (mapnik::image_reader_exception const& ex)
+      {
+          std::cerr << "Raster Plugin: image reader exception caught:" << ex.what() << std::endl;
+      }
       catch (...)
       {
          std::cerr << "Raster Plugin: exception caught" << std::endl;

src/tiff_reader.cpp

@@ -97,7 +97,7 @@ void tiff_reader::init()
     // TODO: error handling
     TIFFSetWarningHandler(0);
     TIFF* tif = load_if_exists(file_name_);
-    if (!tif) return;
+    if (!tif) throw image_reader_exception ("Can't load tiff file");
     
     char msg[1024];