Changed the mechanism to avoid merging components with empty fields

CHANGELOG.md

@@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - PDF PCB Print: option `hide_excluded` to hide components marked by the
   `exclude_filter`.
   https://forum.kicad.info/t/fab-drawing-for-only-through-hole-parts/
+- Internal BoM: option to avoid merging components with empty fields.
+  Is named `merge_both_blank` and defaults to true.
 
 ### Changed
 - Internal BoM: now components with different Tolerance, Voltage, Current
@@ -26,8 +28,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   Can be disabled to use absolute coordinates. (#87)
 - Board View: flipped output. (#89)
 - Board View: problems with netnames using spaces. (#90)
-- Internal BoM: When `merge_blank_fields` is disabled and we compare two empty
-  fields now we avoid a match. So we don't group undefined components.
 
 
 ## [0.11.0] - 2021-04-25

kibot/bom/bom.py

@@ -70,7 +70,7 @@ def compare_field(c1, c2, field, cfg):
     # If blank comparisons are allowed
     if (c1_value == "" or c2_value == "") and cfg.merge_blank_fields:
         return True
-    if not cfg.merge_blank_fields and c1_value == "" and c2_value == "":
+    if not cfg.merge_both_blank and c1_value == "" and c2_value == "":
         # Avoid merging two components with empty field
         return False
     return c1_value == c2_value

kibot/out_bom.py

@@ -270,6 +270,8 @@ class BoMOptions(BaseOptions):
             """ Connectors with the same footprints will be grouped together, independent of the name of the connector """
             self.merge_blank_fields = True
             """ Component groups with blank fields will be merged into the most compatible group, where possible """
+            self.merge_both_blank = True
+            """ When creating groups two components with empty/missing field will be interpreted as with the same value """
             self.group_fields = GroupFields
             """ [list(string)] List of fields used for sorting individual components into groups.
                 Components which match (comparing *all* fields) will be grouped together.