Python: Add test case for missing modules

Author: tausbn

python/ql/test/query-tests/Imports/general/ImportStarUsed.expected

@@ -1,2 +1,3 @@
 | imports_test.py:21:1:21:20 | from module import * | Using 'from ... import *' pollutes the namespace |
 | imports_test.py:22:1:22:32 | from module_without_all import * | Using 'from ... import *' pollutes the namespace |
+| imports_test.py:65:1:65:40 | from module_that_does_not_exist import * | Using 'from ... import *' pollutes the namespace |

python/ql/test/query-tests/Imports/general/UnintentionalImport.expected

@@ -1 +1,2 @@
 | imports_test.py:22:1:22:32 | from module_without_all import * | Import pollutes the enclosing namespace, as the imported module $@ does not define '__all__'. | module_without_all.py:0:0:0:0 | Module module_without_all | module_without_all |
+| imports_test.py:65:1:65:40 | from module_that_does_not_exist import * | Import pollutes the enclosing namespace, as the imported module $@ does not define '__all__'. | file://:0:0:0:0 | Missing module module_that_does_not_exist | module_that_does_not_exist |

python/ql/test/query-tests/Imports/general/imports_test.py

@@ -61,3 +61,5 @@ def __init__(self):
 #Use it
 different
 
+# FP reported in https://github.com/github/codeql/issues/4003
+from module_that_does_not_exist import *