Recuperate from having serialized a missing module.

We may have serialized that the module was not available or
properly configured at the time of serialization. In that
case, the submodel is only one information parameter. Instead
of returning it, we try to instantiate a new model, so that
the user is presented something par with the current
configuration they have.

Author: tinevez

src/main/java/fiji/plugin/trackmate/helper/model/ParameterSweepModelIO.java

@@ -53,6 +53,7 @@
 import fiji.plugin.trackmate.helper.model.parameter.AbstractParamSweepModel;
 import fiji.plugin.trackmate.helper.model.parameter.AbstractParamSweepModelIO;
 import fiji.plugin.trackmate.helper.model.parameter.EnumParamSweepModel;
+import fiji.plugin.trackmate.helper.model.parameter.InfoParamSweepModel;
 import fiji.plugin.trackmate.helper.model.tracker.TrackerSweepModel;
 import fiji.plugin.trackmate.providers.DetectorProvider;
 import fiji.plugin.trackmate.providers.TrackerProvider;
@@ -315,8 +316,36 @@ public TrackerSweepModel deserialize( final JsonElement json, final Type typeOfT
 					}
 				}
 
-				// Normal case.
-				return context.deserialize( element, Class.forName( "fiji.plugin.trackmate.helper.model.tracker." + type ) );
+				// Deserialize from Json
+				final TrackerSweepModel ds = ( TrackerSweepModel ) context.deserialize( element, Class.forName( "fiji.plugin.trackmate.helper.model.tracker." + type ) );
+
+				/*
+				 * We may have serialized that the module was not available or
+				 * properly configured at the time of serialization. In that
+				 * case, the submodel is only one information parameter. Instead
+				 * of returning it, we try to instantiate a new model, so that
+				 * the user is presented something par with the current
+				 * configuration they have.
+				 */
+				// Test if we serialized an error.
+				if ( ds.models.size() == 1 )
+				{
+					final AbstractParamSweepModel< ? > sm = ds.models.values().iterator().next();
+					if ( sm instanceof InfoParamSweepModel )
+					{
+						try
+						{
+							final Object obj2 = Class.forName( "fiji.plugin.trackmate.helper.model.tracker." + type ).getConstructor().newInstance();
+							return ( TrackerSweepModel ) obj2;
+						}
+						catch ( InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException | NoSuchMethodException | SecurityException e )
+						{
+							e.printStackTrace();
+						}
+					}
+				}
+				// Otherwise we return it.
+				return ds;
 			}
 			catch ( final ClassNotFoundException cnfe )
 			{