More informative error handling, more uniform sqlite column parsing

src/main.rs

@@ -9,7 +9,7 @@ use {
 	libadwaita :: { * , prelude :: * } ,
 } ;
 
-use crate :: { error :: * , persistence :: * , ui :: * } ;
+use crate :: { error :: { * , ZoodexError :: * } , persistence :: * , ui :: * } ;
 
 
 
@@ -33,6 +33,9 @@ fn on_activate ( app : & Application ) {
 
 			Ok (())
 		} , |_| () , |error| {
+			match error {
+				CollectionFileError => eprintln ! ("Could not open collection file") ,
+			} ;
 			ui . close_window () ;
 		} ) . await ;
 	} ) ;