added cell label checker and cell labels to the freepdk technology

.gitignore

@@ -10,3 +10,4 @@
 **/model_data
 outputs
 technology/freepdk45/ncsu_basekit
+.idea

compiler/base/geometry.py

@@ -359,7 +359,9 @@ class instance(geometry):
                 for offset in range(len(normalized_br_offsets)):
                     for port in range(len(br_names)):
                         cell_br_meta.append([br_names[offset], row, col, port])
-
+                
+                if normalized_storage_nets == []:
+                    debug.error("normalized storage nets should not be empty! Check if the GDS labels Q and Q_bar are correctly set on M1 of the cell",1)
                 Q_x = normalized_storage_nets[0][0]
                 Q_y = normalized_storage_nets[0][1]