fixed xmlHasNsProp() bugs for defaulted from DTD attribs, added a specific

* tree.c python/tests/Makefile.am python/tests/attribs.py:
  fixed xmlHasNsProp() bugs for defaulted from DTD attribs,
  added a specific regression test
* python/generator.py: xmlHasNsProp() and xmlHasProp() shall
  not raise exceptions when failing to find the attribute.
Daniel
diff --git a/python/generator.py b/python/generator.py
index dbfc5f7..e4618d1 100755
--- a/python/generator.py
+++ b/python/generator.py
@@ -551,6 +551,11 @@
     "URI": "xmlFreeURI",
 }
 
+functions_noexcept = {
+    "xmlHasProp": 1,
+    "xmlHasNsProp": 1,
+}
+
 function_classes = {}
 
 function_classes["None"] = []
@@ -675,6 +680,7 @@
     global primary_classes
     global classes_ancestor
     global classes_destructors
+    global functions_noexcept
 
     for type in classes_type.keys():
 	function_classes[classes_type[type][2]] = []
@@ -799,7 +805,9 @@
 		    #
 		    # Raise an exception
 		    #
-		    if string.find(name, "URI") >= 0:
+		    if functions_noexcept.has_key(name):
+		        classes.write("    if ret == None:return None\n");
+		    elif string.find(name, "URI") >= 0:
 			classes.write(
 			"    if ret == None:raise uriError('%s() failed')\n"
 			              % (name))
@@ -912,7 +920,10 @@
 			#
 			# Raise an exception
 			#
-			if string.find(name, "URI") >= 0:
+			if functions_noexcept.has_key(name):
+			    classes.write(
+			        "        if ret == None:return None\n");
+			elif string.find(name, "URI") >= 0:
 			    classes.write(
 		    "        if ret == None:raise uriError('%s() failed')\n"
 					  % (name))
@@ -935,7 +946,10 @@
 			#
 			# Raise an exception
 			#
-			if string.find(name, "URI") >= 0:
+			if functions_noexcept.has_key(name):
+			    classes.write(
+			        "        if ret == None:return None");
+			elif string.find(name, "URI") >= 0:
 			    classes.write(
 		    "        if ret == None:raise uriError('%s() failed')\n"
 					  % (name))
diff --git a/python/tests/Makefile.am b/python/tests/Makefile.am
index b8ee7b7..9a326e4 100644
--- a/python/tests/Makefile.am
+++ b/python/tests/Makefile.am
@@ -2,6 +2,7 @@
 
 PYTESTS=	\
     build.py	\
+    attribs.py	\
     tst.py	\
     tstxpath.py	\
     xpathext.py	\
diff --git a/python/tests/attribs.py b/python/tests/attribs.py
new file mode 100755
index 0000000..9331a27
--- /dev/null
+++ b/python/tests/attribs.py
@@ -0,0 +1,34 @@
+#!/usr/bin/python -u
+import sys
+import libxml2
+
+# Memory debug specific
+libxml2.debugMemory(1)
+
+#
+# Testing XML document serialization
+#
+doc = libxml2.parseDoc(
+"""<?xml version="1.0" encoding="iso-8859-1"?>
+<!DOCTYPE test [
+<!ELEMENT test (#PCDATA) >
+<!ATTLIST test xmlns:abc CDATA #FIXED "http://abc.org" >
+<!ATTLIST test abc:attr CDATA #FIXED "def" >
+]>
+<test />
+""")
+elem = doc.getRootElement()
+attr = elem.hasNsProp('attr', 'http://abc.org')
+if attr == None or attr.serialize()[:-1] != """<!ATTLIST test abc:attr CDATA #FIXED "def">""":
+    print "Failed to find defaulted attribute abc:attr"
+    sys.exit(1)
+
+doc.freeDoc()
+
+# Memory debug specific
+libxml2.cleanupParser()
+if libxml2.debugMemory(1) == 0:
+    print "OK"
+else:
+    print "Memory leak %d bytes" % (libxml2.debugMemory(1))
+    libxml2.dumpMemory()