方案管理-方案配置，兼容相位差为空

signal-control-service/src/main/java/net/wanji/web/service/scheme/impl/SchemeConfigServiceImpl.java

@@ -644,7 +644,10 @@ public class SchemeConfigServiceImpl implements SchemeConfigService {
             crossSchemePO.setName(name);
             crossSchemePO.setCrossId(crossId);
             crossSchemePO.setCycle(phaseScheme.getCycle());
-            crossSchemePO.setOffset(phaseScheme.getOffset());
+            Integer offset = phaseScheme.getOffset();
+            if (offset != null) {
+                crossSchemePO.setOffset(offset);
+            }
             crossSchemePO.setSource(2); // 来自平台
             crossSchemePO.setIsDeleted(0);
             crossSchemePOList.add(crossSchemePO);