dont add empty polygons to meta group

src/osmfixer/index/StatIdx.cpp

@@ -188,11 +188,17 @@ void StatIdx::readFromFile(const std::string& path) {
 
   LOG(INFO) << "Done.";
 
-  LOG(INFO) << "Building indices...";
+  LOG(INFO) << "Init groups";
   initGroups();
+  LOG(INFO) << "Done.";
+  LOG(INFO) << "Init meta groups";
   initMetaGroups();
+  LOG(INFO) << "Done.";
+  LOG(INFO) << "Init suggestions";
   initSuggestions();
+  LOG(INFO) << "Done.";
 
+  LOG(INFO) << "Building indices...";
   initIndex();
   LOG(INFO) << "Done.";
 }
@@ -242,9 +248,12 @@ void StatIdx::initMetaGroups() {
     auto& mg = p.second;
     util::geo::MultiPoint<double> mp;
     for (size_t gid : mg.groups) {
-      for (auto p : _groups[gid].poly.getOuter()) mp.push_back(p);
-      mg.poly = hull(mp, 11);
+      if (_groups[gid].polyStations.size() == 0) continue;
+      for (const auto& p : _groups[gid].poly.getOuter()) mp.push_back(p);
     }
+    mg.poly = hull(mp, 11);
+    assert(mg.poly.getOuter().size());
+
 
     for (auto p : mg.poly.getOuter()) {
       mg.llPoly.getOuter().push_back(
@@ -312,7 +321,7 @@ void StatIdx::initGroups() {
       }
     }
 
-    // take the longest name as the identifier
+    // take the best fitting name as the identifier
     std::sort(_groups[gid].uniqueNames.begin(), _groups[gid].uniqueNames.end(),
               byAttrScore);
   }
@@ -326,6 +335,7 @@ void StatIdx::initGroups() {
   }
 
   // build hull polygon
+
   for (size_t i = 0; i < _groups.size(); i++) {
     util::geo::MultiPoint<double> mp;
     for (size_t stid : _groups[i].polyStations) {

web/script.js

@@ -363,7 +363,7 @@ function rndrMGr(grp) {
         var gr = grp.groups[key];
         var row = $$('div');
 
-        row.innerHTML = "Relation <a onmouseover='grHl( " + gr.id + ")' onmouseout='grUnHl( " + gr.id + ")' target='_blank' href='" + osmUrl + "relations/" + gr.osmid + "'>" + gr.osmid + "</a>";
+        row.innerHTML = "Relation <a onmouseover='grHl( " + gr.id + ")' onmouseout='grUnHl( " + gr.id + ")' target='_blank' href='" + osmUrl + "relation/" + gr.osmid + "'>" + gr.osmid + "</a>";
         if (gr.attrs.name) row.innerHTML += " (<b>\"" + gr.attrs.name[0] + "\"</b>)";
         row.style.backgroundColor = gr.e ? '#f58d8d' : gr.s ? '#b6b6e4' : '#c0f7c0';