Avoid error when not enough data in log10.

RNA_Seq_Cecere/RNA-seq.snakefile

@@ -1276,8 +1276,14 @@ rule compare_replicates:
                 (r_val, p_val) = pearsonr(data[rep_a], data[rep_b])
                 corr_file.write(f"{rep_a}{warn_a}_vs_{rep_b}{warn_b}\t{r_val} ({p_val})\n")
                 filtered = log_data[[rep_a, rep_b]].dropna()
-                (log_r_val, log_p_val) = pearsonr(filtered[rep_a], filtered[rep_b])
-                corr_file.write(f"log10_{rep_a}{warn_a}_vs_log10_{rep_b}{warn_b}\t{log_r_val} ({log_p_val})\n")
+                try:
+                    (log_r_val, log_p_val) = pearsonr(filtered[rep_a], filtered[rep_b])
+                    corr_file.write(f"log10_{rep_a}{warn_a}_vs_log10_{rep_b}{warn_b}\t{log_r_val} ({log_p_val})\n")
+                except ValueError as err:
+                    if str(err) == "x and y must have length at least 2.":
+                        corr_file.write(f"Only {len(filtered)} points in log10 data.\n")
+                    else:
+                        raise
             corr_file.write("(*): not normal\n(**): log10 not normal\n")