Fix subscribe being broken if no existing subscriptions

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "podcast"
 edition = "2018"
-version = "0.17.4"
+version = "0.17.5"
 authors = ["Nathan Jaremko <njaremko@gmail.com>"]
 description = "A command line podcast manager"
 license = "GPL-3.0"

src/main.rs

@@ -20,7 +20,7 @@ use futures::future;
 use std::io::Write;
 use std::thread;
 
-const VERSION: &str = "0.17.4";
+const VERSION: &str = "0.17.5";
 
 fn main() -> Result<()> {
     // Same number of threads as there are CPU cores.

src/structs.rs

@@ -183,7 +183,13 @@ impl State {
 
     pub async fn subscribe(&mut self, url: &str) -> Result<()> {
         // Make a bloom filter and populate it with subscription titles
-        let mut bloom_filter = bloom::BloomFilter::with_rate(0.1, self.subscriptions.len() as u32);
+        let existing_subscriptions = if self.subscriptions.is_empty() {
+            10
+        } else {
+            self.subscriptions.len()
+        };
+
+        let mut bloom_filter = bloom::BloomFilter::with_rate(0.1, existing_subscriptions as u32);
         for sub in &self.subscriptions {
             bloom_filter.insert(&sub.title);
         }