Fix hang in slices with only run number 0

Free slices that have no valid ODIN banks.

AllenOnline/src/MEPProvider.cpp

@@ -1653,28 +1653,37 @@ void MEPProvider::transpose( int thread_id ) {
       break;
     }
 
-    // Notify any threads waiting in get_slice that a slice is available
-    {
+    if ( have_odin ) {
       std::scoped_lock lock{m_transpose_mut, m_buffer_mutex};
 
       // Update transposed status
-      if ( have_odin ) {
-        transpose_it->slice_index  = *slice_index;
-        transpose_it->n_transposed = n_transposed;
-      } else {
-        m_transposed.erase( transpose_it );
-        m_slice_to_buffer[*slice_index] = {};
-      }
+      transpose_it->slice_index  = *slice_index;
+      transpose_it->n_transposed = n_transposed;
 
-      if ( n_transposed != std::get<1>( interval ) - std::get<0>( interval ) && have_odin ) {
+      // If not all events were transposed, some extra work is needed.
+      if ( n_transposed != std::get<1>( interval ) - std::get<0>( interval ) ) {
         auto& status = m_buffer_status[i_buffer];
         status.work_counter += 1;
         status.intervals.emplace_back( std::get<0>( interval ) + n_transposed, std::get<1>( interval ) );
-      } else if ( m_input_done && no_intervals() && m_transposed.empty() ) {
+      }
+      // Check if we're done
+      else if ( m_input_done && no_intervals() && m_transposed.empty() ) {
         m_transpose_done = true;
       }
+    } else {
+      // Discard the slice if there is no valid ODIN
+      {
+        std::scoped_lock lock{m_transpose_mut, m_buffer_mutex};
+        m_transposed.erase( transpose_it );
+      }
+      if ( msgLevel( MSG::DEBUG ) ) {
+        debug() << "Transpose " << thread_id << ": No ODIN; discard slice " << *slice_index << endmsg;
+      }
+      ++m_slice_without_odin;
+      slice_free( *slice_index );
     }
 
+    // The slice is good, Notify any threads waiting in get_slice that a slice is available
     if ( m_transpose_done ) {
       m_transpose_cond.notify_all();
     } else if ( have_odin ) {