launching from history ok even when some layers are not loaded

MergeBandTableWidget.py

@@ -149,20 +149,27 @@ class MergeBandTableWidget(BASE, WIDGET):
 
     # when launching alg from history in processing, setting parameters
     def setValue(self, value):
+        QMessageBox.information(None, self.tr('window name'), self.tr('message'))
         self.bandClassTree.clear()
         # getting raster names
         param = value.split(';')
         param = [i.split(',') for i in param]
         rasterNames = [i[0] for i in param]
-        QMessageBox.information(None, self.tr('hop'), self.tr(str(param)))
+        # keeping only loaded layers
+        rasterNames = [i for i in rasterNames if len(QgsProject.instance().mapLayersByName(i)) != 0]
         # checking items in combobox
         self.multiLayers.setCheckedItems(rasterNames)
-        # populating second column in table with band future name
-        bandNames = [i[1] for i in param]
-        root = self.bandClassTree.invisibleRootItem()
-        for i in range(len(bandNames)):
-            item = item = root.child(i)
-            item.setText(1, bandNames[i])
+        # clearing table since rasters may not have been added in right order when checking items
+        self.bandClassTree.clear()
+        # for each raster
+        for r in param:
+            # if a raster is loaded
+            if r[0] in rasterNames:
+                # populate columns in table
+                item = QTreeWidgetItem()
+                item.setText(0, r[0])
+                item.setText(1, r[1])
+                self.bandClassTree.addTopLevelItem(item)
 
     # return a list each element for a table row
     # ['band 1, new name 1', 'band 2, new name 2']

merge_rename_bands_algorithm.py

@@ -114,9 +114,6 @@ class MergeAndRenameAlgorithm(QgsProcessingAlgorithm):
         input_param = ParameterMergeBandTable.tableValuesAsList(parameters[self.INPUT])
         output_raster_path = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
         
-        message = 'input_param : ' + str(input_param)
-        feedback.pushInfo(QCoreApplication.translate('merge and rename', message))
-        
         # GETTING USEFUL PARAMETERS
         
         # number of rows in table = number of bands to merge
@@ -135,9 +132,7 @@ class MergeAndRenameAlgorithm(QgsProcessingAlgorithm):
         rasterLayers = [QgsProject.instance().mapLayersByName(i)[0] for i in rasterNames]
         rasterPaths = [i.source() for i in rasterLayers]
         
-        
         # MERGING BANDS
-        
         merge_param = {
                 'INPUT' : rasterPaths,
                 'SEPARATE' : True,
@@ -159,7 +154,6 @@ class MergeAndRenameAlgorithm(QgsProcessingAlgorithm):
                 new_name = band_table[band_number][index_oldname]
             band.SetDescription(new_name)
             
-            
         # RETURNING RESULTS
 
         # Return the results of the algorithm as a dictionary