Created the AnyLineTemplateDevice type to properly handle multiple te…

…mplate types

src/GridCal/Gui/Main/SubClasses/io.py

@@ -292,6 +292,12 @@ def open_file_now(self, filenames: Union[str, List[str]],
         :return: Nothing
         """
         if len(filenames) > 0:
+
+            for fname in filenames:
+                if not os.path.exists(fname):
+                    error_msg(text=f"The file does not exists :(\n{fname}", title="File opening")
+                    return
+
             self.file_name = filenames[0]
 
             # store the working directory

src/GridCalEngine/Devices/Branches/dc_line.py

@@ -142,7 +142,7 @@ def __init__(self,
         self.register(key='fault_pos', units='p.u.', tpe=float,
                       definition='Per-unit positioning of the fault:0 would be at the "from" side,1 would '
                                  'be at the "to" side,therefore 0.5 is at the middle.')
-        self.register(key='template', units='', tpe=DeviceType.SequenceLineDevice, definition='', editable=False)
+        self.register(key='template', units='', tpe=DeviceType.AnyLineTemplateDevice, definition='', editable=False)
 
         self.register(key='locations', units='', tpe=SubObjectType.LineLocations, definition='', editable=False)
 

src/GridCalEngine/Devices/Branches/line.py

@@ -176,7 +176,7 @@ def __init__(self, bus_from: Bus = None, bus_to: Bus = None, cn_from: Connectivi
                                  '0 would be at the "from" side,'
                                  '1 would be at the "to" side,'
                                  'therefore 0.5 is at the middle.')
-        self.register(key='template', units='', tpe=DeviceType.SequenceLineDevice, definition='', editable=False)
+        self.register(key='template', units='', tpe=DeviceType.AnyLineTemplateDevice, definition='', editable=False)
         self.register(key='locations', units='', tpe=SubObjectType.LineLocations, definition='', editable=False)
 
         self.register(key='possible_tower_types', units='', tpe=SubObjectType.Associations,

src/GridCalEngine/IO/gridcal/pack_unpack.py

@@ -1040,7 +1040,7 @@ def parse_object_type_from_json(template_elm: ALL_DEV_TYPES,
 
                             if isinstance(gc_prop.tpe, DeviceType):
 
-                                if isinstance(elm, dev.Line) and gc_prop.name == "template":
+                                if gc_prop.tpe == DeviceType.AnyLineTemplateDevice:
                                     # this is an exception, when dealing with line templates we need to look for
                                     # several types, not only one
                                     seq_templates = elements_dict_by_type.get(DeviceType.OverheadLineTypeDevice, dict())

src/GridCalEngine/enumerations.py

@@ -993,6 +993,7 @@ class DeviceType(Enum):
     SequenceLineDevice = 'Sequence line'
     UnderGroundLineDevice = 'Underground line'
     OverheadLineTypeDevice = 'Tower'
+    AnyLineTemplateDevice = "Any line template"
     TransformerTypeDevice = 'Transformer type'
     SwitchDevice = 'Switch'