Fall back to the linear FDR estimation approach when fuse_count < dec…

…oy_count. This change will affect the results a lot in some cases.

src/main/java/proteomics/Validation/CalFDR.java

@@ -96,7 +96,7 @@ public static Map<String, Entry> calFDR(String sqlPath, boolean cal_evalue, Stri
                 fdr = 0;
             } else if (fuse_count < decoy_count) {
                 printWarning = true;
-                fdr = 0;
+                fdr = (double) (fuse_count + decoy_count) / (double) target_count;
             } else {
                 fdr = (double) (fuse_count - decoy_count) / (double) target_count;
             }