dmsh_entry.py: fix the two lint findings that fail lint-python on main

dm/gfx/nvn/dmsh_chain.h

@@ -1,3 +1,3 @@
 // Generated file (dm/gfx/tools/dmsh_chain.py --header): the B shader library translation chain version this source tree expects (default options), one for every game;
 // the host loads only <library dir>/b-<V>/. Run dmsh_chain.py --header after changing the chain's tools and commit this file with the change
-#define DMSH_CHAIN "d24f05cf9d78"
+#define DMSH_CHAIN "dce4e9cb5054"

dm/gfx/tools/dmsh_entry.py

@@ -4,7 +4,7 @@
 # vs_layer, layer_out, vs_layer_entry), the depth entry point (vs_depth), and a pixel shader's integer and dual-source entry points (int_outputs, fs_uint, fs_dual). Functions of
 # the MSL text only, with no build state, so tests import them. Part of the translation chain (dmsh_chain.FILES) and of every shader's cache key (dmsh_build.py CODE_FP).
 import collections, re, sys
-import dmsh_fetch, dmsh_side
+import dmsh_side
 from dmsh_reflect import attributes, in_word
 
 def vs_writes(src, binds):
@@ -164,7 +164,7 @@ def kinds(e, seen):
             if types.get(e, '').startswith('float'):   # a float local is float bits, unless every value it takes is a register's bits (as_type<float>(…)): PRAGMATA's visibility shaders
                 bits = [re.fullmatch(r'as_type<float\d?>\((.*)\)', x) for x in defs[e]]   # write float _n = as_type<float>(int(gl_PrimitiveID)) into an RG32Uint target
                 if not bits or not all(bits) or e in seen: return {'float'}
-                seen.add(e); return set().union(*(kinds(b[1].strip(), seen) for b in bits))
+                seen.add(e); return set().union(*(kinds(b[1].strip(), seen) for b in bits if b))
             if e in seen: return set()
             seen.add(e); return set().union(*(kinds(x, seen) for x in defs[e])) if defs[e] else set()
         if re.fullmatch(r'-?\d+u?', e): return {'int'} if 0 < abs(int(e.rstrip('u'))) < 0x800000 else set()