Fix sonarqube issues.

Author: staudtMarius

src/main/java/edu/ie3/datamodel/io/source/LoadProfileSource.java

@@ -95,8 +95,14 @@ protected Try<LoadProfileEntry<V>, FactoryException> createEntries(
    * @return the resolution in seconds.
    */
   public static long getResolution(LoadProfile loadProfile) {
-    // currently all registered profiles and all sources use 15 minutes intervals
-    return 900L;
+
+    if (loadProfile == LoadProfile.DefaultLoadProfiles.NO_LOAD_PROFILE) {
+      // since no load profile was assigned, we return the maximal possible value
+      return Long.MAX_VALUE;
+    } else {
+      // currently all registered profiles and all sources use 15 minutes intervals
+      return 900L;
+    }
   }
 
   /**

src/test/groovy/edu/ie3/datamodel/io/source/LoadProfileSourceTest.groovy

@@ -8,11 +8,25 @@ package edu.ie3.datamodel.io.source
 import static edu.ie3.datamodel.models.profile.LoadProfile.RandomLoadProfile.RANDOM_LOAD_PROFILE
 
 import edu.ie3.datamodel.models.profile.BdewStandardLoadProfile
+import edu.ie3.datamodel.models.profile.LoadProfile
 import spock.lang.Specification
 
 class LoadProfileSourceTest extends Specification {
 
-  def "A LoadProfileSourceTest should read in all build-in BDEWStandardLoadProfiles"() {
+  def "A LoadProfileSource should return the correct profile resolution for a given load profile"() {
+    given:
+    def allProfiles = LoadProfile.getAllProfiles()
+
+
+    when:
+    def resolutions = Arrays.stream(allProfiles).map { it -> LoadProfileSource.getResolution(it) }.toList()
+
+    then:
+    resolutions.every { resolution -> resolution == 900 }
+  }
+
+
+  def "A LoadProfileSource should read in all build-in BDEWStandardLoadProfiles"() {
     when:
     def profiles = LoadProfileSource.bdewLoadProfiles
 
@@ -22,7 +36,7 @@ class LoadProfileSourceTest extends Specification {
     profiles.values().every { it.timeSeries.entries.size() == 96 }
   }
 
-  def "A LoadProfileSourceTest should read in the build-in RandomLoadProfile"() {
+  def "A LoadProfileSource should read in the build-in RandomLoadProfile"() {
     when:
     def random = LoadProfileSource.randomLoadProfile.timeSeries