Fix FutureWarnings for testing lxml elements (#979)

Author: geographika

owslib/feature/wfs110.py

@@ -444,9 +444,11 @@ def parse_remote_metadata(self, timeout=30):
                     elif metadataUrl["type"] in ["TC211", "19115", "19139"]:
                         mdelem = doc.find(
                             ".//" + nspath_eval("gmd:MD_Metadata", namespaces)
-                        ) or doc.find(
-                            ".//" + nspath_eval("gmi:MI_Metadata", namespaces)
                         )
+                        if mdelem is None:
+                            mdelem = doc.find(
+                                ".//" + nspath_eval("gmi:MI_Metadata", namespaces)
+                            )
                         if mdelem is not None:
                             metadataUrl["metadata"] = MD_Metadata(mdelem)
                         else:

owslib/feature/wfs200.py

@@ -567,9 +567,11 @@ def parse_remote_metadata(self, timeout=30):
 
                     mdelem = doc.find(
                         ".//" + util.nspath_eval("gmd:MD_Metadata", n.get_namespaces(["gmd"]))
-                    ) or doc.find(
-                        ".//" + util.nspath_eval("gmi:MI_Metadata", n.get_namespaces(["gmi"]))
                     )
+                    if mdelem is None:
+                        mdelem = doc.find(
+                            ".//" + util.nspath_eval("gmi:MI_Metadata", n.get_namespaces(["gmi"]))
+                        )
                     if mdelem is not None:
                         metadataUrl["metadata"] = MD_Metadata(mdelem)
                         continue

owslib/map/wms130.py

@@ -703,8 +703,14 @@ def parse_remote_metadata(self, timeout=30):
                         metadataUrl['metadata'] = Metadata(mdelem)
                         continue
 
-                    mdelem = doc.find('.//' + nspath_eval('gmd:MD_Metadata', n.get_namespaces(['gmd']))) \
-                        or doc.find('.//' + nspath_eval('gmi:MI_Metadata', n.get_namespaces(['gmi'])))
+                    mdelem = doc.find(
+                        './/' + nspath_eval('gmd:MD_Metadata', n.get_namespaces(['gmd']))
+                    )
+                    if mdelem is None:
+                        doc.find(
+                            './/' + nspath_eval('gmi:MI_Metadata', n.get_namespaces(['gmi']))
+                        )
+
                     if mdelem is not None:
                         metadataUrl['metadata'] = MD_Metadata(mdelem)
                         continue