Update base.py

Fix TypeError: Boolean value of this clause is not defined

diff --git a/lib/sqlalchemy/dialects/firebird/base.py b/lib/sqlalchemy/dialects/firebird/base.py
index 9d8630d3c1bcbb9853871ecdcd6de60bdaf21ddd..14e8165c14dbf2ecbacd087311f57822677529e4 100644 (file)
--- a/lib/sqlalchemy/dialects/firebird/base.py
+++ b/lib/sqlalchemy/dialects/firebird/base.py
@@ -300,9 +300,9 @@ class FBCompiler(sql.compiler.SQLCompiler):
         """
 
         result = ""
-        if select._limit_clause:
+        if select._limit_clause is not None:
             result += "FIRST %s " % self.process(select._limit_clause)
-        if select._offset_clause:
+        if select._offset_clause is not None:
             result += "SKIP %s " % self.process(select._offset_clause)
         if select._distinct:
             result += "DISTINCT "