[flang] Fix crash on empty formatted external READs

[klausler]

Summary

ExternalFileUnit::BeginReadingRecord() must be called at least once
during an external formatted READ statement before FinishReadingRecord().
In the case of a formatted external READ with no data items, the call
to finish processing of the format (which might have lingering control
items that need doing) was taking place before the call to BeginReadingRecord
from ExternalIoStatementState::EndIoStatement. Add a call to
BeginReadingRecord on this path.

flang/runtime/io-stmt.cpp

 ExternalFormattedIoStatementState<DIR, CHAR>::ExternalFormattedIoStatementState(
     ExternalFileUnit &unit, const CHAR *format, std::size_t formatLength,
     const char *sourceFile, int sourceLine)
     : ExternalIoStatementState<DIR>{unit, sourceFile, sourceLine},
       format_{*this, format, formatLength} {}
 
 template <Direction DIR, typename CHAR>
 int ExternalFormattedIoStatementState<DIR, CHAR>::EndIoStatement() {
+  if constexpr (DIR == Direction::Input) {
+    this->BeginReadingRecord(); // in case there were no I/O items
+  }
   format_.Finish(*this);
   return ExternalIoStatementState<DIR>::EndIoStatement();
 }
 
 std::optional<DataEdit> IoStatementState::GetNextDataEdit(int n) {
   return std::visit(
       [&](auto &x) { return x.get().GetNextDataEdit(*this, n); }, u_);
 }