only rethrow exception when one is actually caught

Author: SpaceWalkerRS

src/main/java/net/ornithemc/ploceus/LibraryUpgradesCache.java

@@ -111,8 +111,9 @@ private List<Library> getLibraries() {
 			if (ce != null) {
 				project.getLogger().warn("unable to read library upgrades from cache for gen" + intermediaryGeneration() + " " + minecraftVersion(), ce);
 			}
-
-			throw new IllegalStateException("unable to fetch library upgrades from meta for gen" + intermediaryGeneration() + " " + minecraftVersion() + ", and it is not in the cache", me);
+			if (me != null) {
+				throw new IllegalStateException("unable to fetch library upgrades from meta for gen" + intermediaryGeneration() + " " + minecraftVersion() + ", and it is not in the cache", me);
+			}
 		}
 
 		return libs;

src/main/java/net/ornithemc/ploceus/OslVersionCache.java

@@ -135,8 +135,9 @@ private Map<String, String> getModuleBaseVersions(String version) {
 			if (ce != null) {
 				project.getLogger().warn("unable to read OSL module base versions from cache for gen" + intermediaryGeneration() + " " + version, ce);
 			}
-
-			throw new IllegalStateException("unable to fetch OSL module base versions from meta for gen" + intermediaryGeneration() + " " + version + ", and it is not in the cache", me);
+			if (me != null) {
+				throw new IllegalStateException("unable to fetch OSL module base versions from meta for gen" + intermediaryGeneration() + " " + version + ", and it is not in the cache", me);
+			}
 		}
 
 		return baseVersions;
@@ -310,8 +311,9 @@ private String getModuleVersion(String module, String version, GameSide side) {
 			if (ce != null) {
 				project.getLogger().warn("unable to read OSL module version from cache for gen" + intermediaryGeneration() + " " + version, ce);
 			}
-
-			throw new IllegalStateException("unable to fetch OSL module version from meta for gen" + intermediaryGeneration() + " " + version + ", and it is not in the cache", me);
+			if (me != null) {
+				throw new IllegalStateException("unable to fetch OSL module version from meta for gen" + intermediaryGeneration() + " " + version + ", and it is not in the cache", me);
+			}
 		}
 
 		return moduleVersion;