Show builders without detected problems

Only 3 builds are shown for these.

Also, reduce the number of builds shown from 70 to 50.
Add an ellipsis if some are hidden.

Author: encukou

master/custom/release_dashboard.py

@@ -303,7 +303,10 @@ def problems(self):
         problems = []
         for builder in self._root.builders:
             if builder.branch == self:
-                problems.extend(builder.problems)
+                if builder.problems:
+                    problems.extend(builder.problems)
+                else:
+                    problems.append(NoProblem(builder))
         return problems
 
     @cached_property
@@ -682,8 +685,11 @@ def get_severity_and_description(self):
         return severity, description
 
 
+@dataclass
 class NoProblem(Problem):
     """Dummy problem"""
+    builder: Builder | None = None
+
     name = "Releasable"
 
     description = "No problem detected"

master/custom/templates/releasedashboard.html

@@ -206,7 +206,10 @@ <h5>
                                         </div>
                                     {% endif %}
                                     <div class="build-dots">
-                                        {% for build in builder.builds[:70] %}
+                                        {% for build in builder.builds %}
+                                            {% if loop.index0 == (50 if builder.problems else 3) %}
+                                                ⋯ {% break %}
+                                            {% endif %}
                                             {{ build_dot(build) }}
                                         {% endfor %}
                                     </div>