Fix broken requests

The requests for sorted constructed molecules and sorted building
blocks were broken, as they were not returning any molecules. This
was discovered simply by trying to view sorted constructed molecules
and sorted building blocks in stk-vis. The origin of the bug for
the sorted constructed molecules request was due to the fact that the
the query in `sorted-constructed-molecules/Request.js` was wrong. It
was filtering out constructed molecules, rather than keeping them.
Probably due to copying code from the other requests and forgetting to
edit it.

Fixing this revealed a second bug in the request. When the molecules
were getting sorted by "Num Atoms", the table had no "Num Bonds"
entries, and vice versa. This was also happening in the sorted
building blocks request. The reason for this is that I was returning
`sortedBaseMolecules`, which did not contain the results of the data
query, rather than `molecules`, which did.

To help future debugging I've also made all the building blocks
contain a value in the "Num Atoms" collection in the test database.

src/Requests/sorted-building-blocks/Request.purs

@@ -120,7 +120,7 @@ request options = do
 
         molecules = Utils.addValues sortedBaseMolecules collections
 
-    collection <- _collectionPromise sortedBaseMolecules
+    collection <- _collectionPromise molecules
 
     pure
         (Result

src/Requests/sorted-constructed-molecules/Request.js

@@ -52,7 +52,7 @@ exports.query =
                             ],
                         },
                         {
-                            '$eq': [
+                            '$gt': [
                                 {'$size': '$constructedMolecule'},
                                 0,
                             ],

src/Requests/sorted-constructed-molecules/Request.purs

@@ -120,7 +120,7 @@ request options = do
 
         molecules = Utils.addValues sortedBaseMolecules collections
 
-    collection <- _collectionPromise sortedBaseMolecules
+    collection <- _collectionPromise molecules
 
     pure
         (Result

test/make_test_database.py

@@ -70,6 +70,12 @@ def build_database_1():
         num_atoms_db.put(molecule, molecule.get_num_atoms())
         num_bonds_db.put(molecule, molecule.get_num_bonds())
 
+        for building_block in molecule.get_building_blocks():
+            num_atoms_db.put(
+                molecule=building_block,
+                value=building_block.get_num_atoms(),
+            )
+
 
 def build_database_2():
     """