(re)throw EOF exception when next_dvector() has not yet read any items

src/potential_file_reader.cpp

@@ -144,6 +144,8 @@ void PotentialFileReader::next_dvector(double *list, int n)
 {
   try {
     return reader->next_dvector(list, n);
+  } catch (EOFException &) {
+    throw EOFException("EOF reached");
   } catch (FileReaderException &e) {
     error->one(FLERR, e.what());
   }