added check before division to avoid div by 0 in coverage and id computing

GrAnnoT/Functions.py

@@ -666,8 +666,13 @@ def get_id_cov(feature_id,seg_size,target_list): # seg_size has unoriented segme
         add=segment_id_cov("end_deletion",seg_size,source_list[i:],'',first,feature,last)
         match+=add[0];subs+=add[1];inser+=add[2];delet+=add[3];first=add[4]
 
-    cov=round((match+subs)/(match+subs+delet),3)
-    id=round(match/(match+subs+inser+delet),3)
+    denom_cov=match+subs+delet
+    denom_id=denom_cov+inser
+    [cov,id]=[0,0]
+    if denom_cov>0:
+        cov=round((match+subs)/(match+subs+delet),3)
+    if denom_id>0:
+        id=round(match/(match+subs+inser+delet),3)
     #var_count=count_variations(feature_id,target_list)
     return [cov,id]