Only attempt to extract table, pk and param name if report datasource…

… is not None

src/report_compiler.py

@@ -199,7 +199,7 @@ def compile_report(self, report_filename, fill_params, tmpdir, resources, permit
         self.logger.info("Report datasource: %s" % datasource)
 
         # Try to extract primary key and table name
-        if not compile_subreport:
+        if not compile_subreport and datasource:
             queryString = root.find(".//jasper:queryString", namespace)
             if queryString is not None and data_table is None or data_pkey is None:
                 statement = re.sub(r"\s+", " ", queryString.text)