Fix bug: germline

workflow.wdl

@@ -16,8 +16,8 @@ import "./tasks/annovar.wdl" as annovar
 workflow {{ project_name }} {
   
   String sample_id
-  File tumor_fastq_1
-  File tumor_fastq_2
+  File? tumor_fastq_1
+  File? tumor_fastq_2
   File normal_fastq_1
   File normal_fastq_2