(derive_new_entry): Added an error check if only a payee is specified

for "entry" but the payee wasn't found.  (This came from the mailing
list, thanks guys).

1 files changed, 3 insertions, 0 deletions

diff --git a/derive.cc b/derive.cc
index 41a01370..1c8964b5 100644
--- a/derive.cc
+++ b/derive.cc
@@ -34,6 +34,9 @@ entry_t * derive_new_entry(journal_t& journal,
   added->payee = matching ? matching->payee : regexp.pattern;
 
   if (i == end) {
+    if (! matching)
+      throw error("Could not find a matching payee");
+
     // If no argument were given but the payee, assume the user wants
     // to see the same transaction as last time.
     added->code = matching->code;