ICSHWI-10398: Bugfixing loading indicator for statistics page

src/views/statistics/StatisticsView.js

 import React, { useEffect } from "react";
-import { Paper, Grid, useTheme, makeStyles } from "@material-ui/core";
+import { Paper, Grid, useTheme, makeStyles, LinearProgress } from "@material-ui/core";
 import { useStatistics } from "../../api/SwaggerApi";
 import { useGlobalAppBar } from "../../components/navigation/GlobalAppBar/GlobalAppBar";
 import { RootContainer } from "../../components/common/Container/RootContainer";
@@ -53,10 +53,13 @@ export function StatisticsView() {
     return (
         <RootContainer>
             <Grid container direction="column" spacing={theme.spacing(0.5)}>
-                {statistics &&
+                <Grid item xs={12}>
+                    <h2>Statistics</h2>
+                </Grid>
+                
+                {statistics ?
                     <>
                         <Grid item xs={12}>
-                            <h2>Statistics</h2>
                             <PrimeKeyValueTable obj={prometheusStats} labels={["Network monitoring"]} />
                         </Grid>
                         <Grid item xs={12}>
@@ -66,8 +69,13 @@ export function StatisticsView() {
                             <PrimeKeyValueTable obj={statistics.networkScopesIocCount} labels={["IOCs per network scope according to the deployment tool"]} />
                         </Grid>
                     </>
+                    :
+                    <Grid item xs={12}>
+                        <div style={{ width: "100%" }}><LinearProgress color="primary" /></div>
+                    </Grid>
                 }
 
+
                 <Grid item xs={12}>
                     <Paper className={classes.paper}>
                         <DeploymentLineChart title="Successful deployments over time by the deployment tool" chartLabel="Deployed IOCs in time" hook={useDeployedIOCStatistics} />