Merge pull request #461 from fast-aircraft-design/issue-460_optimizat…

…ion_viewer_fix

Issue 460 - Optimization viewer fix for 0.0 bound values

src/fastoad/gui/optimization_viewer.py

@@ -199,14 +199,11 @@ def _update_optim_variable(variable: Variable, optim_definition: Dict):
             optim_definition[section_name] = {}
         if name not in optim_definition[section_name]:
             optim_definition[section_name][name] = {}
-        if meta["lower"] and not isnan(meta["lower"]):
-            optim_definition[section_name][name].update({"lower": meta["lower"]})
-        else:
-            optim_definition[section_name][name].pop("lower", None)
-        if meta["upper"] and not isnan(meta["upper"]):
-            optim_definition[section_name][name].update({"upper": meta["upper"]})
-        else:
-            optim_definition[section_name][name].pop("upper", None)
+        for bound in ["lower", "upper"]:
+            if meta[bound] is not None and not isnan(meta[bound]):
+                optim_definition[section_name][name].update({bound: meta[bound]})
+            else:
+                optim_definition[section_name][name].pop(bound, None)
 
     def display(self):
         """