python: Inline expectation should have space after $

This was a regex-find-replace from `# \$(?! )` (using a negative lookahead) to `# $ `.

python/ql/test/query-tests/Exceptions/general/exceptions_test.py

@@ -61,35 +61,35 @@ try:
     val.attr
 except Exception:
     print (2)
-except AttributeError: # $Alert[py/unreachable-except]
+except AttributeError: # $ Alert[py/unreachable-except]
     print (3)
 
 class MyExc(ValueError):
-    pass 
+    pass
 
 try:
     pass
 except ValueError:
-    pass 
-except MyExc: # $MISSING:Alert[py/unreachable-except] # Missing due to dataflow limitiation preventing MyExc from being tracked here.
-    pass 
+    pass
+except MyExc: # $ MISSING:Alert[py/unreachable-except] # Missing due to dataflow limitiation preventing MyExc from being tracked here.
+    pass
 
 class MyBaseExc(Exception):
-    pass 
+    pass
 
 class MySubExc(MyBaseExc):
-    pass 
+    pass
 
 try:
     pass
 except MyBaseExc:
-    pass 
-except MySubExc: # $MISSING:Alert[py/unreachable-except] # Missing due to dataflow limitation preventing MyExc from being tracked here.
-    pass 
+    pass
+except MySubExc: # $ MISSING:Alert[py/unreachable-except] # Missing due to dataflow limitation preventing MyExc from being tracked here.
+    pass
 except Exception:
     pass
 
-    
+
 #Catch BaseException
 def catch_base_exception():
     try:
@@ -97,13 +97,13 @@ def catch_base_exception():
     except BaseException:
         #Consumes KeyboardInterrupt
         pass
-    
+
 def catch_base_exception_ok():
     try:
         illegal_raise()
     except BaseException:
         raise
-    
+
 def legal_handler1():
     try:
         illegal_raise()